Created attachment 147410 [details]
An example of doing arbitrary editing to a vector in Sai by holding various modifier keys while clicking or dragging points and curves

SUMMARY
Currently when setting a shortcut in Settings -> Configure Krita -> Keyboard Shortcuts, you can set actions to combinations of keys and modifiers, but you are unable to set them to combinations of modifiers and mouse clicks!

STEPS TO REPRODUCE
1. Visit Settings -> Configure Krita -> Keyboard Shortcuts and expand a shortcut
2. Attempt to set it to Ctrl + Click
3. Hope it's not too much work to add and humble yourself before the Lords of Kirta Development to humbly request this ability be granted to you and your kin

OBSERVED RESULT
Ctrl gets recognized, but the mouse click doesn't

EXPECTED RESULT
Ctrl + Click gets recognized as a binding for the shortcut

SOFTWARE/OS VERSIONS
Windows: 11 Build 22000.527
Qt Version: 5.12.9

ADDITIONAL INFORMATION
The inspiration for this wishlist item is the way you edit vectors in Paint Tool Sai! (Which is driven almost entirely by holding various modifiers and clicking or dragging paths and points)

Currently, even with Sai's shortcut presets, the modifier + mouse shortcuts are currently absent

And while I understand that it would require more effort to allow configuring such a setup, the general existence of this ability is one of the biggest things I miss from Sai when I use Krita, so I figured I'd file a formal request for it on behalf of people with Sai muscle memory to maybe help them use Krita more readily~ (Plus, this might open the door to allow plugin creators to add this style of editing more completely if they can intercept modifier click combinations to begin with)

I've attached a video of random vector editing in Sai only using a tablet's tapping (mouse 1), combinations of modifier keys, and one Ctrl + T (transform) to give an idea about the style of editing I'm talking about