You're welcome, I don't mind helping. I tested it more thoroughly, results below:
Not Working
33.20&2.5.1 results:
Right click to open context window first time, console spammed with Cheat Menu.
Right click second time, game locks up and have to force close.
WORKS
34.26&2.5.1:
Open context window, no console spam, select Insta-kill Melee, no console spam, equip rolling pin, insta-kill zombie. Then equipped bat in one hand, no insta-kill. Equipped bat in both hands insta-kill works. This version seems to be working fine. Insta-kill only works with two handed weapons if weapon is equipped in both hands.
WORKS (see edit)
33.20&2.5.1NAC:
Right click, no console spam, select Insta-kill Melee, no console spam, equip rolling pin, console spam and insta-kill not working.
Unequip rolling pin, console stops spamming, equip baseball bat in both hands, console spammed and insta-kill not working. All other cheats work.
EDIT:must have weapon equipped before enabling Insta-kill Melee or it won't work and console will get spammed. Two handed weapons like baseball bat, golfclub and poolcue must be equipped in both hands to insta-kill
34.26&2.5.1NAC
Same results as 33.20&2.5.1NAC
I have all the consoles saved if you'd like them. I have attached the one that didn't work
33.20&2.5.1.txt