Yeah agree, most would expect the behaviour that switching back to the original pen takes an additional pen down->up cycle.

I think this can be refined a little bit.

What I have in mind is more in line with what Microsoft Journal is doing : When an object is selected and the pen is used somewhere else, if the stroke is short, then it's cancelled. But if not (if you write a longer stroke), the stroke is preserved.

The logic is probably similar to what's done in rnote currently : the pen switches back immediately, but we check the length of any stroke that cancelled a selection and decide based on that to keep it or not to keep it.

That sounds like a good idea!

If I may add on to that issue since I think it's not worth a separate discussion, since this issue seems to have the goal of making things more configurable. For me it also feels unintuitive that the selection tool requires an extra pen-up, pen-down cycle when you delete the current selection. Maybe it should be configurable, or at least behave the same as the normal exit behaviour, but I don't think I ever deleted a selection and then wanted to select something else instead of returning to the previous tool.