@Voksuuhm:
1/ It's in the long-press menu (both in the FM & favorites list). But, given 2/, fair warning: it's *blocking*, so you might want to fix things up manually first so that it backgrounds properly or something. If you need fancy visual feedback, you might be able to cobble something together via fbink (e.g., what happens w/ zsync2 during an OTA). Not familiar w/ syncthing, though, so eh, maybe easier said than done
.
2/ Nope. That was deemed (mainly by me and myself ;p) a fairly gnarly idea for these platforms when that was implemented
on Android.
If you *really* need it, my answer from that issue was essentially: wrap KOReader's startup script in your own custom script.