I answer first to the last point (6), the translation is probably very low quality, I think natives will probably yell at me.
I agree with scroll/swipe (3) and feedback on actions (5): I can assure I will do something for the latter whereas for the former gestures just don't play well together and so far didn't find a workaround.
As long tap to toggle collapse on comments (1) it is a nice idea, thank you! I'll add it as soon as possible. Swipeable tabs (2) were not implemented by choice, but having the gesture on the tab control at least, I agree, can be handy and users will expect it.
Thank you again... I'll probably release a new version in the weekend so stay tuned.