The latest Snapshot allows commands to be searched when adding a new mouse gesture.
0_1563465619369_Search Commands for Mouse Gestures.png
This goes some way to resolving the problem of finding commands, but it assumes that users know the correct wording of the command.
In my opinion, sorting the list alphabetically would be a better solution.
Specs: AMD A10-6800K, 8 Gb on Win 10 64-bit 1809 build 17763.615 ā¢ Snapshot 2.7.1609.4 (64-bit)