Will be awesome to have checkbox to keep or delete top-level folder of torrent content, in RSS also.

Check out the Auto-Select feature in Settings > Transfers > Files.  It's midway down, where it says "Auto-select files in new transfers".  Click the Configure button.  There's stuff in there to drop the top-level folder for a single file automatically.

If it's multiple files, when the pre-load window pops up, you can ctrl-a to select all the files, then rt-click and select a directory for them, and they will all end up there.

And if it's multiple files and auto-downloading from RSS? ;)