@t3kk Gotcha. Changing the accent color is possible as of fairly recently (Preferences -> Appearance -> Accent Color).
The timeline gap behavior is somewhat more complicated, and I've gone through several iterations of how it works. There's a fine balance to be had between making scrolling back through the timeline seamless and making sure what's below the gap is still accessible.
If the 'Load More' gap is filled in automatically as you scroll back, whatever is below it becomes inaccessible—which is a problem if you didn't mean to scroll up above it. Right now, if you tap the floating 'Jump to Present' button when it appears, the gap and everything below will be removed from the timeline, and scrolling back will load posts automatically.
I'm wary about adding preferences to change the behavior here, because it's already complicated enough without introducing more edge cases.