lets go with BG series.
just look at it. part one, expansion, part two and another expansion, mod that combains b oth of them into one huge game, countless mods with extra maps, quest, spells blablabla. BG is truely HUGE with all the mods and addons but still the core story has been left untouched. evertything that moders can come up with is new side-elements. and after so many years it feels like an old car with hell load of addons. basicly you can have X number of extra content but do you like it or not - you MUST follow the main story which after so many times of being finished is just plain borring and painfull.
from 3 years ive been trying to create a mod suitable for "Sandbox" label but being jut one person i find myself unable to finish it once and for all.
and what do i mean by Sandbox?
basicly, Sandbox game/mod is non-linear and quite offten - endless, which means the game never actualy ends or the main story can be picked whenever you feel like it and doesnt force you to stick to it. a great example of sandbox game was good old Daggerfall, Morrowin or Oblivion (which all are parts of Elder Scroll serie), another great example is underrated Guild 2, or rather young Hinterland. Also the sandbox grandpa from S-F stream was the game Elite which offred endless universe to explore and play. Gothic 1 and 2 can be play as sandbox as it has a big open/ended worlds (especialy Gothic2). the ultimate sandbox games can be found in world of MUDs and Rougelikes such as Dwarf Fortress, ADOM and most of rouglikes.
and why they are so great? lets look for the features:
- there is always something to upgrade/extend (new skils, weapons, house, items ect)
- majority of content is optional and its totaly up to player what he wants to do
- huge part of the deal is exploration which brings the feeling of discovery which brings an increbile joy as one of the strongest thing of humanity is curiosity
ofcourse i am trying to be realistic here and i know that such feature in full cannot be implemented into IE engine or would requaire tons of work and powerfull mod team which would be more like creating a new game rather then expansion. but try to remember...
how cool it is to have a stronghold in BG2. doing quests, improving the stronghold itself
how great is to use Cromwell/Caspenar services and improve you gear
how joyfull it is to collect rare spells and gain new skills
its all about getting better and better or should i say: its all about improving, extending, upgrading.
do you even remember what RPG stands for? RolePlayGame. good story means good game but nothing can surpass the ultimate fun of freedom and what freedom you have being bind with mainstory chains?
now i would like to give you some examples, all of them i stared as a mod but never finished.
1. good old Islander idea:
basicly you had a nice trip on a ship. then the storm came and your ship sinked so you wake up alone on an island, you build you house, forge your weapons, armors. hunt for animals and resources, trade skins, or other stuff with local tribe and stuff. imagine yourself being like Robinson Crusoe. the end of the game would be leaving the island and returning to mainland somehow.
2. Young wizard/hunter/priest
you come to village/ small town and buy/create your house. you protect the city, learn new spells/hunting tricks, you sell your products, brew potions, improve your house, hire mercineries, hunt for bandits, and stuff. game ends when you become the mayor of the city ort after reaching point "X" (which can be enything, from a exact level or achivement)
3.Trader sim
you travel from town to town making money, trading items, hireing guards, buyng storagehouse, establishing new trade routes, exploring and stuff

4. Dwarf Mines
you are a young dwarf which obtained a map of new resourcefull location full of gold, gems nad/or mithril so you start an underground mine, new dwarf arives, new tunnels are being mined, you hire blacksmiths, jewelers, goldsmiths and others, you hire warriors, train them and so you finaly become a new dwarf king
5. Defence style sanbox
basicly like most TowerDefence/defence flash games offers it all about defending your "base" from incomming waves of enamies when meanwhile you improve you base, guards, walls, traps and all that. its all about surviving as long as you can (check Left 4 Dead).
after all this examples i belive you should understand what iam looking for and what IE modding world totaly miss and lacks of. ofcourse i am not that naive - this idea(s) are plain and old as computer games itself and i know that the reason - why no one made something like this - is obvious and solid.
which is: any of this ideas would need to be a Total Convensions and even if not - would require hell load of people from all types of modding. scripting, codding, GFX artists - everything and everyone.
so why do i waste my breath saying all this? because after seeing so many incredible mods and few of them could be a standalone games, i simply cant imagine why no one would give ti a try with this.
and i am dreaming. dreaming about things i cannot have.
or do i...?
sorry for typos. english is not my main and i am doing my best to make my text readibly. if i failed hard - sorry.
Irbis