For a consistent user experience, it would be nice to allow the user to open the contextual menu ("finger menu") even when in transform or delete shape modes, for example. Now the only option to get the menu back is to use the top menu bar, and the user may wonder why the menu no longer opens. This may not be feasible to implement consistently, but at least with a big touch screen (with the top bar not so easily reachable) it would enhance the user experience.