3e Extended Critical in 4e - what would break?

[mburr0003]

Originally Posted by sir_pudding

Enhanced Critical GURPS Monster Hunters Power-Ups 1 p. 11

Note, that this is a leveled specialized Perk with only 3 levels, so for 'full value' (3 points) and having all it's Prereqs (which is a good list), it gets the PC to critiing on 9 or less in one skill.

That's a pretty good way to do it,

There is also Every One’s a Critical, Dungeon Fantasy Denizens Swashbuckler pg 26. It's different, it works with all melee weapon skills, only increases crit range to 7, but also allows a reroll on the Critical Hit Chart. It's a Daredevil refluff, so it does cost 15 points, but looks comparably priced due to it's expanded weapon listing.