As most servers have this command for their Admins and GM's- Disguise.
I think it would be an help for people when they want to see a monster's attack sprite and animations, etc. Here's my way of it being used.
@disguise <Monster's Name or ID> <Size from 1-4> and there you go. The reason i added size because some people laugh at huge Porings and etc. But there should be some limits-
1) you CANNOT PvP when you are disguised
2) a disguise will last for only 5 minutes then you revert.
3) Your size will NOT change when you revert. (like im a size 3 Poring, but ill still be a normal size person when I revert.)
4) you can only disguise 10 times per log-in. (To prevent abuse)
I think this a great idea, and this is the first suggestion for the test server.