If it's possible to make it as an option that would be great. FB handles this quite nicely.I think it's a good idea to stop giving suggestions when user hit space, those usernames are uncommon anyway. For the [bd] Tag Me add-on, it does not support spaces in suggestion by default, administrator has to go into the option page to make it work. Talking about trade offs
PS: @Mike liked my post. Ooh hoo!
For some languages many user names without spaces may look ugly. I have this feeling that you have minimum character count setting to fire suggestion popup. Enabling spaces as a configurable option will be nice to have as well.This is currently intentional and it's a balance of being "right" versus making many unnecessary round trips to the server.
Is there any way I can change the character limit? On our boards, several users have their usernames as 'Firstname Lastname'. Many first names are more than 8 chars long and I'd like them to appear in the tagging suggestions.