I would really like the following change:
Let us join guilds and friends lists with our character name instead of account name if we so choose.
This should be an option we can choose, not the way it is now with the "one size fits all" approach in which you join friends lists and guilds with all your alts automatically because you are forced to join with your account name. Please give us the choice whether or not we want this.
I really like the idea of joining faction specific guilds, but since I play alts on all factions I either have to set my status as offline and be seen by none or as online and be seen by all. It does not give us the option to have faction specific guilds when we have alts on different factions the way it is currently. At least not the way I like to see it.
This way you can join for example a Dominion only guild with your Dominion alt and never be seen as online when playing alts of different factions who you could join guilds with for those factions.
Also joining with your character name gives the added bonus of really feeling you joined with that character, that Nord alt that joined a Nords only guild for example. Get known within a faction, separated from your alts on different factions, with your character name and not lose part of that the moment you join a guild or friends list.
The online/offline/busy/etc status option is a nice one we already have, but it is account wide which is in my opinion not so nice.
Some may say that this would encourage people to join a guild, empty the guild bank and move on, but the only thing you can do against that now is contact a GM and with this change those GM's would still be able to link the character with the account because of the logs they keep.
P.s. This change is not about the security issue of having half your login open for all to see, although related there have been plenty of topics about that already. Probably about this issue as well, but not seen one in a while.