Grouping would be definitely interesting. It'd also be interesting in the context of creating a custom tool out of existing ones. However at the moment it's still not planned for short term.
One question will be: how do you know if the user is dragging the mouse to create a selection or just trying to move the image around.Regarding pencil tool, merging the pieces of the drawing would be easier to implement as a short term mitigation of the problem.
Regarding temporarily hiding a drawing or a group of drawings, how would you "unhide" it ?
to answer your questions:
- You could have a space dedicated to group of drawing (just like key images) that way, the user could select the drawing there and then move them around.
- Same for hide/unhide. the user would go to the group drawing space and select a group and a hide/unhide button or right-clicking it would display a contextual menu with hide/unhide option.
If you'd be willing to chat about that, I'd be happy to help you design that feature. I'd even be willing to chip in some money to accelerate the development of this feature.
Let me know if you're interested