I think this is the kind of thinking that caused Dante to go underground. IT IS A COOKIE CUTTER PROGRAM ( it says do a 4-8, then a 20 rep widowmaker), but people were taking so many liberties that what they were doing was not DC, as Dante saw it.
What I am concerned about when I see people doing 20 reps squats by themselves ( and not as a widowmaker) is that it becomes a means of not working the legs as hard as they can, which I see as a far too prevalent disease in gyms.
I'm not an expert but like I've said before I know this program very, very well. One of the older pieces of advice DC gave was something like this: If you think you're working hard squatting a certain weight for 6-8 reps, lower that weight a ltitle and go for 20 reps, that'll show you what working hard is all about. 20 rep leg work is brutal but like anything else you have to know how to do it. If you do 4 plates a side on a leg press for 20 easy reps that's not a workout, slap 700lbs on there and go until you can't go anymore, go until your legs are like jelly. If you think your gonna die at 15, don't lock your legs out but "rest" with your legs bent just a little, take in 2-3 deep breaths and go again. I don't care if you take 10 minutes to do your set but you better fry your fucking legs if you didn't then you have no one to blame but yourself.
I've said it before and I'll say it again, you have to learn how to train hard, you don't just say, "I'm gonna kill myself doing legs today" you might think you worked hard but there's a difference. When my legwork is done my quads are shaking...bad. They sometimes cramp up but I don't care, if I don't beat my book I suck. Bottom line.
If someone is inclined to work outside of the rules, so be it. it's up to them but if they fail and don't make the progress they want to it's thier own fault, don't blame DC. I do very little tweaking of the program, it's very basic, very heavy and very brutal. this is how this program works best but remember heavy is relative.
The program-the original dog logg, I'll find and copy and paste the leg portion, it's a good read.