I wouldn't say having to switch windows user is really a "support" for multiple accounts. What happened to being able to easily log in and out from the game client?
Many people have different steam accounts. I think a survey shows that more people have 2+ steam accounts than people who have just one.
Can we support multiple accounts on a single PC? or allow one DCS account to bind to more than one steam accounts? This would truly be something of value to those who want to access their modules purchased from different steam accounts.