I've found that tixati does not have the option to delete the downloaded .torrent file when removing(remove only removes from tixati window).

on utorrent there are 3 choices, remove, remove and delete torrent, and same plus torrent+files.
i always use the middle one as after i finish downloading i dont want my HDD littered with torrent files, but i can't find where to do that in tixati, any ideas?

torrent files are VERY small so deleting them serves little purpose.
It is detrimental because without the torrent, you can't continue to share if someone needs files you have.

Tixati doesn't have this option because it doesn't need original .torrent file after it is loaded. Tixati makes a copy of that file (probably) in core.dat and core2.dat files located inside %appdata%\tixati folder (on Windows).