Hi
I've had to make a decision to keep Topic on top and replies descending.
If I change it to replies on top latest first then Topic will end up on bottom.
I think it's best readers read topic first then hit reply button. Their reply will go to the bottom each time however there is no other way unfortunately.
You can sticky your Topics by using Edit button after posting then scrolling down below open Options and marking 'Sticky' then Send (Re post) again. Doesn't appear you can do this on the first Send (Post).
Regards
Retro