Steam is refusing to merge any future key purchases, so if you want to use DCS via Steam make your key purchases via Steam. This has some shitty implications because some third parties are only considering releasing their modules via Steam at present (MiG-21Bis being the one I know well they've said they'll only think about it at this point).
http://forums.eagle.ru/showthread.php?p ... ost2085202
DCS non-Steam purchases will no longer be merged
Moderator: RLG MGMT Team
Re: DCS non-Steam purchases will no longer be merged
Dunno anything more than what's in their forum post :/
Re: DCS non-Steam purchases will no longer be merged
Do not know - I've only heard from Eagle Dynamics.