Feal Thas

I have Baldur's Gate Trilogy loaded up and started a new game. I had a friend do it and I am not certain which of the options he enabled, but I have three questions that I hope someone among you know the answers for.

1. I get 10 xp per spell level when I write spells, and 10 xp for picking a lock, 24 for removing a trap. Does this amount increase later to the normal SoA levels, or not? Anyone know the way this works?

2. I can't find Durlag's Tower or Ulgoth's Beard on the map though ToSC was loaded as part of the set up. Anyone know what's up with that and how I can access them (I haven't went north and tried to go to Ulgoth's Beard - but it isn't on the map like normal and Durlag's Tower is not accessible from any of the neighboring terrain at the moment - it just isn't there)? I am still in the middle of the original adventure in BG.

3. Are there xp caps as part of BGT? How does xp levels work?

Thanks.

Feal Thas