That will create additional server load, not very good idea.
CB uses such links and use 1 query to get username for each link to user profile, so i.e. CB simple users list page uses 63 database queries, some of them are even equal. This is very bad.

... is enough) + phpBB friends and foes with CB connections 8-) + added redirect of phpBB members to any url - possible to show CB member list by this link + redirect of phpBB User Control Panel to any url - can use CB profile here +phpBB profile tab of recent user's posts/topics (configured by admin, ...

I think one of the most important things to get nailed just now would be linking your phpBB Avatar with your CB one. Of course some thought would be needed into how that was done. Should you be able to change the avatar in both CB and phpBB? or should you have ...