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Adaptive mouse sensitivity

I like my mouse to have high sensitivity so that it can move fast across the screen, but sometimes this makes it hard to perform a high-precision click

I found a nice solution which is to use a keyboard shortcut that, when pressed, lowers the mouse sensitivity. Then, when I need to perform a high-precision move, I hold the key, and let go when I'm done

This has been working pretty well, and is fairly easy to implement using sway:

input type:pointer {
    accel_profile "flat"
    pointer_accel 1.0
}

bindsym XF86HomePage exec swaymsg input type:pointer pointer_accel -- -0.6
bindsym --release XF86HomePage exec swaymsg input type:pointer pointer_accel -- 1

I use WWW Home, which is otherwise a useless key, configured on the left-hand side of my keyboard (XF86HomePage in the Sway config above).