[CremisiSteam]

Things that should be client widgets would probably be things like.

Tailor (Servers that have custom tailors/bodies would have a switch to disable it.)
MP3/Radio player (Servers that have custom sounds/music could would have a switch to disable it.)
Chat-Room (Basically the same thats already accessible.)

Actually what else would be allowed for a generic widget 0.o?

Maybe a universal kill/death counter?
Player Checker (Checks a players stats on any selected server that wished to be joined in. IE: If your on era you could check someones stats on Zodiac and see their level of last log on/equipment. If your on Zodiac you could check what an era person has.)
Mainly it would be up to what the servers would want you to be able to see. (Would require them to make their own attachment only showing what they want you to see.)