I hate to break this to you guys, but you allready are beta testers in everything but name. Anyone who has played SE4 and taken the effort to submit an error report to MM, or to this forum is more or less a beta tester. SE4 undergoes about the same number of released patches as the average beta tester would get, and we are evaluating these patches as we speak.
Now, I don't mean this in a bad way; in fact, I thoroughly enjoy it. MM is responsive to our requests, releases patches in a timely manner, and keeps us informed of what is going on. This is in stark contrast to almost all other game companies. Like I said, this could always be Reach for the Stars!
I for one, am glad to finally encounter a game company that cares about it's customers after the first patch is released.
Derek