You are looking for Blender's or GIMP's search and run command thing. E.g. https://docs.blender.org/manual/en/latest/interface/controls...
UPD: I just add such feature request[0], think it would be solved very soon, as such pop-up should be very similar to current "Keyboard" tab of "Preferences" dialog ;)
[0] https://github.com/olive-editor/olive/issues/265
@krispbyte, GET latest nightly build[1] while it hot! ;-)
[0] https://github.com/olive-editor/olive/commit/952c67972b9e19f...
[1] https://github.com/olive-editor/olive/releases/tag/continuou...
[0] http://libregraphicsworld.org/blog/entry/winter-break-recap-...
UPD: I just add such feature request[0], think it would be solved very soon, as such pop-up should be very similar to current "Keyboard" tab of "Preferences" dialog ;)
[0] https://github.com/olive-editor/olive/issues/265