Version 1.63 of arma 2 OA is the best for mods but it does have some downsides. Many improvements and fixes to the weapons and vehicles are just not there. For example BTR-90's do not have thermal imaging, many weapons are missing their secondary CQB sight (such as the AK-107 with PSO).

This bothered me so what i did was go to the Addons folder and copy "communityconfigurationproject_e.pbo" and "corepatch.pbo" and pasted them in a different folder on the root directory of the game, as if it was a mod.
This does not seem to affect much in terms of mod compatibility so far. Maybe it conflicts with AI mods as the corepatch file has some AI improvements. But i am not quite sure.

The result is an "half-patched" game. I think it is a good compromise.
...or am I just creating a monster?