This is my 3rd mod and the 3rd alternative. If the mutation version is too much of effort to activate it while you also want to use the demonic melee weapons, use this :) . This mod will automatically activate both of my previous mods, "Calamity Trigger Neo" and "Desperado" even in Singleplayer mode, Campaign etc. As this is a vscript mod with "scripted mode", it will probably have conflicts with other custom weapon mods, but it works well with other mutation mods.
In short, this mod includes the previous custom melee weapons with the powers to burn zombies and heal the wielders, and the "desperado" guns that have various effects depending on what guns you're using, like, healing ability, health buffer ability, auto incendiary ammo, auto explosive ammo, auto laser sight, and auto explosion (like the propane tank/ grenade launcher).
Well, enjoy the mod...
Note: If you, by chance, still don't know which slot the melee weapon is in this mod, try to press 7. I put it on slot 7 to make it able to carry both pistol and melee weapon.
*Updated: Added "Petrol Bullet" :D . See the Changelog about the details.
*Updated: Added a new "bug" on purpose :D . See the Changelog about the details.
*Updated: Added kind of a little help if you, by chance, are playing on a custom map with low to no melee weapon. The clue is: look for oxygen tank, & your wish is granted :D