Piano Roll Editor issues

Not sure if these have been reported before. Running MS 3.6.2, Windows 10.

a) The drop down directly under the piano keyboard doesn't even fit the word "Duration" let alone any of the other options that have very long descriptions of which many start with the same 6-7 letters that do fit.
b) The text field under that with the spinner to set the value can't fit the whole 1000 value that is the default for "duration"
c) Non-obvious behaviour for "Duration (multiplier)" - it seems that 1000 means "full length" and 500 means "half length" etc., but when using just "Duration", it seems to be that 0 means 'full length', and you need negative numbers if you want to reduce it by n units (whatever that unit is). In other words there's no way to select a bunch of notes and set them all to a fixed playback duration amount regardless of the engraved duration? That's actually exactly behaviour I happen to want in a score I'm working on currently, where some notes are quavers and some crotchets but they should basically all have the same playback duration (about 75% of a quaver length).
d) If the first time after starting MS you open the piano roll editor on an empty measure then close it, then after selecting measure/staff with notes, and re-open it, it doesn't auto-scroll vertically to show those notes. In fact it seems the piano roll only auto-scrolls the very first time you open it in each session. I'd think it should always auto-scroll.
e) Not obvious how to easily switch which staff/instrument is being shown from the Piano Roll editor dialog itself (I'm not sure you can?). Would be good to have a "follow" mode where it auto-switched to whichever staff you selected (or the first of them, if multiple)
f) Undo doesn't work as expected if multiple notes are selected - it creates separate undo events for each note. I had 100s of notes selected...