If you're looking for ideas, I don't think you need to support other browsers like Fennec or Midori initially, although long-term that might be nice. But creating a simple GUI for the key script settings would be a big boost in user-friendliness.

Tso mentioned including this in Pipeline's dbus-switchboard. That program allows you to change file associations, like what program is invoked when an HTML file is opened. But that's not quite what this script does, right? It's more a switchboard just for the Web panel specifically, right? IIUC and if you buy my logic, it could be called Web-switchboard.