As the title says I found a way to break the frenzy levels, using a certain feature:
The "B" button ;P
Simply tap it the whole level and it slows down everything significantly!
So if you have a plan for the level just do it and it is easy as hell!
I recommend disabling the B (and -) botton feature for Frenzy levels.
I attach a replay of "Cunning 21" from "LP II" whre I just kill 3 Lemmings without even trying hard (If I had paid a bit attention there 100% would be a no brainer).
Hm, you could still exploit it by using the savestate feature, though this isnt' as tidy and as such still requires decent reactions...
I'll think about what to do with this.