Coins turning into gems also make a lot of puzzles impossible, Cooba. How about an option to disable/enable it? Also, Lori start pos isn't pointless, if it was there you'd be able to e.g. enable a trigger for Lori that would let her pass areas that need a high jump.

The chat-invincibility would be an option a server host could set. In duels it should obviously be turned off, but in "fun servers" it would be useful, I guess.

Clarification: (:P)
Kick vote: Ability to call a vote for kicking someone. If it gets anough "yes" votes, the player gets kicked.