in eagle and fusion, provides access to common functions from the side buttons on my mouse
in fusion, lets the third mouse button act as the scroll wheel to orbit without giving me arthritis
toggles mute/unmute with button on headphones in zoom
makes ctrl+shift+5 use snipping tool to take a screenshot (to fix muscle memory from mac, and to prevent typing so much)
That's it. This is a pretty simple project. The main challenge here was learning ahk, which was totally worth it. I'll log it every time I make some changes.