Thanks everyone for your response. I know from experience that every time you suggest something to an MMO, there's bound to be people trolling, so you have to see if you can minimize it.

Quote Originally Posted by lyndwyrm View Post
As for exploits, changing classes during a loot roll might be able to cause some problems, but if it's a vote probably not too many.

I've also seen a few of the opinion that it will cause many dungeon runs to "require" people (read: many people expect of others) to have multiple geared jobs at 50. For instance, bring 4 dps (SMN+BLMx3) or something else for all the trash in a dungeon and then have one person switch to tank/heal for bosses.
For both of these problems, I suggest that you can ONLY change class at the beginning of a dungeon/raid, OR after a complete wipe. Although this restriction will not allow for creativity (such as going full dps for trash), it will prevent loot concerns and unreal expectations.