For volume automation, the scrollwheel of the mouse can be used to write/change the value, if the output window of a track is opened and the volume value is highlighted.
Right now, the increments are very small, like 0.1 dB per detent.
There could be a preference of how many dB one detent of the scrollwheel changes (like 0.1 or 0.5 or 1.0 or 2.0 or ...).
Like with nudging clip gain.
Changing the vol automation value with the mouse could include a "glide"-feature. Meaning, no abrupt step up/down, but a contineous glide (like Auto Match), specified by time (e.g. 0.5 sec / 0.75 sec / 1.0 sec).