The high level plan is to finish audio in 3.7 (in video export, etc), then for 3.8 the big feature is (tentatively!) a curve editor so you can see how values change over time with a graph-like UI. For the (relatively) smaller features like those you mentioned, we regularly do triage and decide on which are highest priority. However, even that must remain flexible, as all kinds of things can come up and rob our time. The most I can say is that your input is well noted and that we are doing our best to get things done!