One idea I had to show off just how much time you're saving would be to rip the video from a level from the previous run, and put it side by side with the practice run (kinda like how the 2p coop quake videos are done). Granted this is heavily time consuming, but it might be a cool thing for when you actually finish the run (would be even cooler to have it published on the site too).
How do you show 2 videos side by side? I can do it in vegas, is a video editing program the only way?
Update on the practise run: I have now got up to p3c6 so not much left to plan. Part 3 is such a bitch to plan, I have to do most kills in bullet time and can't just run past people.
I have just spent ages trying to work out how to get the p3c5 super jump and normal jump consistently. My conclusion is you need to super jump in exactly the right spot, then hold forward, he will either slip off fairly quickly (you didn't jump right) or he sort of lock on and then I just press jump. Its much easier and better than alternately spamming jump and forward and hoping for the best. If I don't manage the jump before my bullet time meter runs out its run over but its just such a big time saver I cannot afford to miss it out. In fact I have barely missed out any super jumps. Basically, any jump I miss is because it only saves 1-3 seconds and if you miss it once its slower.
p1c8 I don't do the 2nd super jump as unless you get it 1st time its actually not faster due to enemies coming behind you, who you would have to kill.
p2c2 I don't do the 1st super jump as you will die from the shotgunner unless you get it 1st time. I go a different way and cut the 4 super jumps near the end down to 2 and even if I would have got all 4 super jumps first time (HA!) it would only be 1s faster.
p2c4 I do 2 jumps instead of a super jump over the fallen shelves.
p3c1 I attempt the super jump but if I don't get it first time I have a contingency plan.
p3c2 Obviously I just jump up instead of super jumping up.
p3c4 I don't do the 2nd super jump as unless you get the jump first time its 2-3 seconds slower.
So far, just over 15 minutes faster with a predicted time of 1hr 4mins. Actually, I think aiming for the practise run time wouldn't be out of the question as I have made some different weapon choices and noted them in the video which may save some time and just generally I will be able to be tighter in places so it will be interesting to see.