Since the league granted the Rockets a Disabled Player's Exception, could that mean that the league could possibly allow an extra reserve spot on the roster as well? I remember this happening in the 2005-06 season when the team went down with multiple injuries.
No. See this reply to a comment on Jonathan Feigan's blog: http://blogs.chron.com/nba/2009/07/pondering_the_rockets_future_w.html#comments