Feature: Alternate selection mode for easier touchpad usage?

I rarely use my computer with a physical mouse attached, so I need to use the touchpad to make selections. When selecting larger regions, the click-drag-release method of defining the region often doesn't work well (even when pointer movement is configured quite fast). Would you consider adding an alternative mode (i.e. a CLI option to switch to it) where the first click/tap sets the first corner, then the cursor could be moved freely with no button held, and the second corner would only be set after a second click/tap?

As with my other feature request, I might look into implementing it myself. I've essentially no knowledge of sway/slurp/wayland internals, though, so if someone else would go ahead, I'd appreciate it a lot. Thanks!