afaik steam does not do this, is it a recent feature?
>>Apparently some of Valve's singleplayer games let you do so.
> Yeah, some do such as Half-Life 1 where it'll prioritize downloading of the binaries first, then the levels.
> Granted it makes for long load times if you hit a level transition for a map that's still downloading.
> Granted, the list that support that 'feature' are slim.