I always wanted (un)fold recursively in Geany and after checking Geany's source code i just discovered, that Geany already supports that folding actions.
So probably it would be nice to have menu items for Fold, Unfold, Toggle Fold, Fold Recursively, Unfold Recursively, Fold All and Unfold All, because all actions are currently supported (but eg toggle only using keybinding and recursive (un)fold only using mouse + configuration +/- shift key).