Is your feature request related to a problem? Please describe.

I'm clearly looking to compare Lapce with VScode, and one feature I do use a lot, and would need to be able to make a full switch is related to multicursor.
Right now, in order to add a multicursor with the mouse in Lapce, the keybind is hardcoded to alt+shift.

This is an issue for me as alt is the modifier I use for swaywm, meaning the keypress would never go through.

Describe the solution you'd like

Being able to change this keybind, I would use ctrl+shift

Describe alternatives you've considered

Not using it... but that aight a good solution

Additional context

To be clear, I want to old down a keybind and clic around in my code to add multiple cursor at these places.