Video demonstration:
https://imgur.com/wXzBGxj
When dragging on the MIDI ruler, it ignores mouse modifier settings and will always create a time selection. Even when the mouse modifier for "MIDI ruler > left drag" is set to "No action", it will still create a time selection when dragging on it.
The expected result is that it follows mouse modifier settings. If I set it to "No action", it should do nothing. In the case of the Arrangement ruler, it will fallback to the "left click" modifier upon releasing the mouse.