Not that I know of. The only way I think would be for the author to share the whole unpacked folder for you to edit the mod yourself.

Tell me what you are looking for and I might help. I pretty much know what everything does by now, as I'm currently working on a mod like Cold Crisis ;-)

@Kierk,
I want to start with small changes. Let's say, I want to slightly increase durability for some items (shovel, hatchet, etc) and make saw blade not breakable in one use. AFAIK, the "HP" is determining parameter for these changes, am I right?

Yes, one hp = one use, e.g. the saw blade have 1 hp, so it can only be used once before breaking. I think putting -1 means unbreakable, but I'm not sure (lockpicks are the exception, they always break on use, no matter how many hp they have).

You can click on "Items" and check the right panel to compare each item's stats. "Destroy on Use" might be another stat to look for when changing durability.