So I downloaded it to look through the code for you. Open the zip, and navigate to modules/client/options.cs on line 166 you'll find RTBCO_registerOption("OV::OverlayKeybind","keyboard\tshift tab"); once you find it, change it. Obviously you can use a different shift option easily, like "keyboard\tshift i" if you need help figuring out what specific command you want to input then just reply here and I'll help out again,