Sice upgrading to UBB 5, my users (at nwtekno.org) have been complaining about the loss of the ability to search by member name. Now I understand that this change is related to the ability of people to change their memeber names, but it seems like it would still be possible.
A hack to search by member name should be pretty simple (convert member name to member number, then send it off to the standard search), but a trickier and more useful solution would be a hack to search by member name and get all of the posts by that user, even when they were using different public names. A public-name history isn't recorded anywhere in UBB6 as far as I know, so that would have to be added as well.
But really, just a search by name would be great.