Thanks, glad you like it.
That's unfortunately a constraint of IPB itself. If you check profile fields, you'll notice the same issue.
This does appear to be a bug, I've noted this and will have it fixed next update. If you've got ftp access to your site, I might be able to put together a patch in the meantime.
Not currently supported but I'll see what integration support requests offer and look at adding it in a future version.