You need (or rather, "I used") wmv2xmv converter to change regular videos to xmv then named them the corresponding titantron filenames in the titantron folder (f:games\WWE Raw2\Movie\Tron_small). Very simple.
The trons are named in series i.e. "scha_000... scha_001... scha_002..."and though they are not named specifically, they are in the order the titantrons appear in the CAW screen. For example, the Rock's Titantron is first in the CAW and so it is "scha_000" and so on. WHATEVER xmv you name "scha_000" and place into that folder will play when the game searches for that tron- regardless of size, length, or dimensions.
Since you cannot (or rather, "I haven't tried to") add movies, only replace existing ones, if you do not BACKUP YOUR ORIGINAL titantron files, you will lose them by process of overwriting.
Custom soundtracks makes it so that music hacking is almost pointless, except that when you view your hacked movies in theatre mode the default wrestler's music will accompany it. Replacing the corresponding wav file (in the sound folder) will remedy this.
I also replaced the credits movie with a 1 second black screen so that beating season mode doesn't kill five minutes of your life.
Hope that helped.
R.I.P. NinjaHacker... you WILL be missed.