Greetings M'Lord! The team here at Firefly have been reviewing all the player feedback regarding the CPU Lord creator tool. Amongst the overwhelming positive support, we've noticed the point raised regarding the lack of the ability within it to use custom video/voicelines etc.
We're happy to say that it's looking very much like we've come to a solution, and that in the near future you will have the ability to make custom video/voicelines available with your CPU creations by using popular external sharing sites - for example, Nexus Mods.
While this function will not be available through Steam Workshop, we hope that this change will allow you to be your most creative selves! Subject to testing and some guide documentation to be written up, we're aiming to have this up and running by the end of next week at the very latest.
All the best, Sire!