Using two keyboards, different layouts

I use two keyboards on the mac, the default mac keyboard and a windows default (Microsoft wireless desktop).

I use the microsoft keyboard one for the left hand, and the mac keyboard for the right hand.

The problem is that when I press a key on microsoft keyboard like shift/ctrl/alt/esc, and another key on the mac it doesn't get detected as a combination. I have to press the full combination on the same keyboard.

Is it possible to override this?

I'm used to typing ⇧ (Keyboard A) and char (Keyboard B) in order to get an upper case char.