We already talked about the limitation of discrete parameters for smoothly changing continuous values. An improvement is planned, from what I understood.
I think a great improvement, resolving this case as well as others, would be to have a configurable seek speed on continuous settings themselves (especially volume). The seek speed on the parameter causes some problems: while changing parameter value, we often want some things to happen immediately (trigger a sound, transition somewere else on the timeline) but have smooth automation transitions on continuous settings. If there were a seek speed on that settings (ie volume) in addition to the parameter seek speed, it would resolve all those problems, and allow a bunch of things.