I do the edits of the video myself but I fear that my personal agenda may get in the way from time to time, not only that, I also need time to be writing the scripts which contains the lines that need to be voiced, thus, when that happens, I may need an extra pair of hands.

The work you are expected to do will not be much. Mostly just helping in adjusting the timing of the voice lines to the game.
You just need to be able to:
1. Cut gameplay video
2. Cut audio tracks
3. Adjust audio tracks to match the gameplay video

Also, only audition for this if you are using Sony Vegas version 14.0 or previous ones as the video editing software.
The reason being, I need the supporting editor to be able to directly take over editing of the ".veg" file.