What you think about content type based buttons or button-groups which toggles depending on content type (same way and in addition to the new automatic toolbars)?
Example for a button-group:
GRP1: Toogles on when lister shows pictures (GRP2 is off then)
GRP2: Toogles on when lister shows audiofiles (GRP1 is off then)
Or - instead of using groups and what I would prefer - an option to custome each button that way. Example:
The button is normally placed in a toolbar and will be shown if choosen content-type is activated in lister. Maybe this could be solved within the command itself (instead of a pulldown) to give more options like e.g. thumbmode as condition.