i think scal's $$$ has more to do with his roster spot than love for him.
Of course. If Scal's contract was not valuable to this team, then he would likely be gone...not sure if it would have made much of a difference with Miles though. He simply did not look like a player who was ready to play NBA minutes any time soon...if ever again. Although the roster crunch helped make the decision easier, I don't think it was the only reason.
He wasn't given enough minutes to get a read. They decided long ago that he wasn't going to make this team because of Doc's love of both Scal and Cassell who are flawed players and quite frankly neither of them have seemed to show any desire to improve in their time here. I know im talking about the 15th man but I was really hoping we could dump Scal before this year.
He may not have been given enough minutes for you to get a read, but the coaching staff and management got to see him in practice for weeks, in addition to the games. They saw plenty of him to be able to see where he was.
Besides, it doesn't take a lot of time for him to show that he is a lot slower and less explosive as he used to be.
isn't a recovering and hopefully improving Darius Miles more valuable long-term than Sam Cassell, who in the pre-season practice and game coverage i've seen, continues to ignore the flow of the offense and just jack it up with no regard for the good of the team 
?
No. For one, we don't know if Miles is recovering and improving. He seemed like a guy who still had a lot of work to do. But Cassell on the other hand gives this team some insurance at a position where they need more insurance, since they are counting on a guy who they don't want playing PG (House), and a second year guy, who was pretty terrible last year.
Also, forgive me if this comes off harsh, but there is no way you can tell anything from his 0 minutes of playing time in the preseason, and a couple clips from practice.