My response in () below:

1) When you want to use outs 3 or 4 plus the L&R, you are losing the internal effects for all the outs. The whole keyboard becomes dry.
(This is true and had been mentioned in the X1 manuals ... don't know if it is in the SD1 manuals or not).

2) Wave files imported and processed in the sd1 sampler synchronize with the tempo of the style but when you change tempo while playing the pitch of the sampled loop changes simultaneously. (Correct! Wave sync was designed [at this time] for minor drum loops such that tempo effects to pitch changes would be minimal. I believe a 'fix' is on the way for longer loops/files.)

3) Will be very helpful if in the pattern edit they add: loop recording, copy measure, insert measure, erase or delete measure, and also event editing. (I agree)

4) The velocity curve function in page one of the utility does not function at all. There is no difference between the different parameters like fixed, user1, soft, normal, and so on. I am surprised nobody noticed that yet. (Hmm ... strange b/c this works on my current SD1 keyboard. Change settings and the strength:volume ratio changes. At 'fixed', independent of velocity, volume is constant.

5) There is a serious delay in the fill ins if you are using styles that contain real drum loops or wave files. All the styles I use contain wave files or real drum loops in the drum2, and it is so annoying to have delay when using fill ins. If you turn the auto crash off it kind of helps, but what is
a fill in without a crash at the end of it. (Already addressed this in a previous post).

6) This could be a bug: when in pattern edit, copy mode, if you are copying different things from one arran. to the other and when you come back to the pattern edit record page the instruments change and also just about every time your drum2 loop gets erased as well so you have to reset the original instruments and drum2 loop over and over again if you are using the copy function of the pattern edit.
(Although the SD1 allows you to change eg. from ARR A to ARR B [while REC], without saving, it is advisable to SAVE/F5 whenever you've recorded an ARR component. This way, it's settings are memorized prior to you moving on to next part).

Hope this helps!
AJ

PS: I am not aware of an official OS_3.0 release at this time.