That one was still easy, but the Imp Portal room fight in level 2 of CI was pretty challenging this time around (it never was previously for me), so kudos for that.
Thanks, glad you liked it.
Charmed imps/mephits don't seem to have their spellcasting/innate abilities when controlled by the player, intended?
Yes, for two reasons.
1) Per PnP rules, Charm Person and similar spells are not supposed to grant the caster absolute control over his opponents' abilities
2) It would require a pretty heavy script rewrite (NearestEnemy vs. GOODCUTOFF) which would ultimately diminish their effectiveness
P.S.
Out of curiosity, how did the trapped Cambion fare in your game, assuming you were using 3.63?