Unfortunately both of these actually do interfere with the current UX and neither are only positive. This means both will need to be togglable settings.
The reasoning for (1) is, I've seen users complain for other apps that it was annoying that tapping a comment collapsed them because sometimes they were trying to tap a link and missing. The current behavior when gestures is on is it would just expand the actions which will not really interfere with the tap.
The reasoning for (2) is, currently tapping an icon doesn't just expand the image, it also expands all content for that post (you are essentially looking at the entire post). Changing the behavior to tap to see image would get rid of the ability to see the entire post if the user wanted to (me being a user of my app, I want this lol). Technically right now, if you wanted to see the image you can tap once to expand and tap on the expanded image even if its only partially shown to see the image in the image viewer. This is sort of a workaround but it requires 2 taps.
I think for a complete solution these will need to be toggles you can enable within settings.