Hi Chudy Picio,
Well, when I started this mod, years ago, it was actually a "Red Storm Rising" (Tom Clancy novel) concept, where the majority of the fighting was to occur in West Germany. Then, I decided to take that RSR mod idea to a whole new platform using Apex Mods' Heroes Unleashed, and dropped the original concept.
After finishing RSR, which still needs some real work done, btw, I decided to pick up where I left off with the original (now ZAPAD) mod. I made it more or less from missions left over or unused from the first campaign.
So, long story short, the lack of Polish forces/civies was a combination of mod-recycling and, now that you mentioned it, a big oversight. I found a Polish Army mod in the GR downloads section (http://www.ghostrecon.net/files2/index.php?act=view&id=69) but the link is broken. If it could be repaired, I am sure it could be used alongside ZAPAD to add Polish forces to the mix.
I would love to get back into modding, and perhaps I will this winter, but right now I do not have the time. If I do find time, I'll see what I can do to include Polish forces (they of course are a necessary addition!) in a patch that also dials down some mission intensity/difficulty.
Thanks for the interest and the advice!