You're too fast for me :-) I still wanted to respond on your question in another thread.
The settings tabs are a bit of a legacy in Roundcube and should be improved by a roundcube:object type of thing that collects all entries using a plugin hook. We're not yet there but expect some changes on this.
See https://github.com/roundcube/roundcubemail/commit/c49c35ca0f and https://github.com/roundcube/roundcubemail/commit/cf46aefd9d
Great! Thanks. I'll go play with it as soon as I can move my 0.9.x to master :)
Cor