Time for a reality check. Roundcube is an open-source project, developed by a group of unpaid volunteers. This group has done an outstanding job of developing the best web-based email client available. But they are only human, and their solutions and preferences will not always please everyone.
From that point of view, the additional time and effort required to maintain two entirely different skins would seriously slow the development process, and I support their plan to pick one and concentrate only on that. (I should say here that my organization has made larry the default, and we are not allowing users to select the classic skin, either. Saves us headaches on support if all users are on the same skin.)
And of course, if you don't like something about it, you can always use the existing package as a base, and modify it to suit your needs.
-- Arne Berglund System Administrator, Internet Services Lane Education Service District Eugene, OR ____________