Expanded ability to bind keys to transpose a chosen amount of notes

[simon-wh]

Currently, the Shift key will transpose all notes a fixed amount of notes (1), while it is pressed, however, this feature can be expanded.

What this could look like is to have the ability to bind an arbitrary key to transpose the notes by an arbitrary amount (e.g. +12, +1). With the choice for this to be active only while the key is pressed, or for the key to behave as a toggle of the transposition being active.

If multiple keys are bound to transpose notes, these would stack, so having both a +12 and a +1 active would result in a resulting transposition of +13 on all notes.

It would also be helpful to have the ability(for keys in 'toggle' mode) to select an additional key to be bound to reset the transposition or to have a key that could be bound to reset all transpositions.