going half and half is really no different than one of you buying it and copying it for the other.  It sharing software, which is not cool.

IIRC Stardock's TOS allows their games to be installed on more than one computer. In that regard you are fine. I would doubt though if that allows for two different persons to be using that feature. 

I would call that exploiting Stardocks's good nature.

Both installations would be able to submit games to the MV, and be updated through Impulse.

I guess it comes down to your moral fibre if you would deny SD of the income from what would be two seperate users and should be two seperate registered copies.

Thanks, folks. I'll stick around to see if Moosetek's question is answered also.

If you're roommates/housemates, it's iffy (we allow it for LAN games with our multiplayer titles, and allow it to be installed on multiple machines for the owner's own personal use in singleplayer) since you're planning to play simultaneously. If you don't live together though, you definitely must buy your own copies.