About 1 – I can see that it is a problem if the OS does not properly recognize the event. I guess the easiest way of fixing it would be to make a setting for the single tap behavior in the app.
About 2 – I haven’t thought about the download issue, as my pictures are always on the device. I thought it would be handy to just quickly do a guesture (as holding) and directly see the raw version. But as you describe it, the short delay isnt from switching to edit mode, but actually loading and decoding the raw file, so the behaviour would be the same even with a gesture. I see that’s problematic.