First of all, i apologize lots for not uploading the
enemies pack as promised. The "adjustments" i've made are ready, but Yukes patch showed up and i incremented it more and more and more, until it was 2AM in the night and i had to sleep.

My fault, sorry guys.
But the
Enemies Pack is being uploaded as i digit this, so don't worry. In less than a couple hours the upgraded
pack will be up. And i'll double post to confirm it.
Now, to answer questions:
-Are you planning to add support for other iwads in the future?
Yes, i am.
Kriegsland is not as versatile as Flakes Doom, however (the mod where i'll take my own IWAD patches to work on), but if anything else comes handy, you'll be able to play
Kriegsland in other IWADS.
-I think it would be possible to introduce a system of improvements to each weapon as it appeared in the new order
Possible, yes, easy, ehhh... maybe not. I conseidered special stuff for weapons, but to think i'll have to have a double just for a specific upgrade or action... the code, size, and care needed to not break stuff will go sky high. The best i can do is things like the STG-60 stuff Deii suggested and i answered just below.
-What do you think of adding some non-standard weapons such as tubes that were in the old blood?
I like the idea. Really. But where to make them spawn, or how, are question marks.
-What do you think of adding new enemies where everyone would have every possible weapon possessed by us? (ie that from someone we would be able to get eg mg-92 and from someone else blitzgewehr),I think that for starters a good idea would be replacing the current supersoladaten on that with the new order or with the old blood where after his death we could get mg-92
Already noted down. i do have official plans to make each variant of the Ubersoldaten wield a different game weapon. The MG92 could be dropped by the Heavy Machine Gunner (archvile rare spawn). But i warn you guys, they will use YOUR weapons. And that's gonna hurt.
Ah, I'm a little bit late to the underslung rocket launcher, but I think you could just make it more of a grenadelauncher that uses handgrenades for ammo - if I'm not mistaken, various militaries tried to streamline supplies by using grenades that double as rifle grenades and hand grenades to varying degrees of success, even though it never went anywhere aside of testing purposes. Then you could (potentially) just map the grenade launcher to the hand grenade key. Or something. Just a brainfart, it probably would cause lots of headaches if attempted to...well, be actually coded.
Why i haven't thought on something like this is unknown to me. It's actually a good idea. A simple Boolean ACS would do the trick, just like Flakes Doom. No need to duplicate weaponry. Only complicated thing; sprites. But, being only one weapon doing that, i don't really mind giving it a boost. For now.