Possible bug report: I couldn't figure out how to exit looping mode, and had to refresh the page.
Not sure if you can fix this: two-fingered left scrolling in the tab area activates my browser's "back" function.
To exit looping mode, just press Pause? Or were you just trying to clear a selection? (If the latter, just click anywhere in the timeline canvas.)
I have searched high and low for a fix to that two-fingered left scrolling in Chrome, and there doesn't appear to be a way to fix it. :-( If anybody knows, please tell me!
1) put the annotation inside a container (and make that position:relative); annotation position:absolute, right:0px; 2) autoscroll the container 3) add some JS to infinitely increase the width of the container on a left-ish mouse move. (I think this will still work even if the container is, itself, in a cropping container.
I suspect the result will be that 2-finger left swipe will be like quicksand - no apparent movement. Kind of sucks, but less than losing your page.
An alternative would be to make history back/forward suck less: keep the display state in local storage and render a page just as it was the last time a person saw it (in terms of time display, modes, and selections).
Probably that's a useful thing to do anyway and has Least Surprise in its side.