I'm not sure whether the engine supports stats over 10, and in fact I think it's not such a good idea.
You can, however, apply penalties when wielding heavy weapons, and remove them when PA is equipped and/or perk is taken.
Just how long do you need them to be? even with a 2-letter prefix, it's still some trillion names.
To avoid cryptic names, you can use something like "#define SGVAR_LOOTER "p_looter". A bit longer, yes, but I think improved compatibility is worth it.
After you register on github, you create your own repo, and upload the files there.
(Also, you can check out my signature for various translation projects)
Maybe I haven't. I'm just saying that if you have a question about a build - updating sfall or whatnot, it's probably best to ask the one who uploaded it.