I know you hate it when I agree, but I do agree with this.
A team shouldn't be allowed to sign a player in midseason that puts them over the cap. This should include renegotiations. A team should be allowed to do whatever it wants. However, it should also not affect the balance of the game. Dropping a top notch tackle would have to fall into that category.
Now, I've looked at Seattle. He was dropped as well as the other 3 tackles on the team. Seattle has done a bunch of resignings, and gotten himself over the cap through these resignings. But these guys that were released were not the highest paid players on the team. The one RT in question, Burton, was JUST resigned by the team. So it couldn't have been on purpose.
So, I think the problem is allowed resignings to go over the cap. I was careful with my resignings, by only doing a few at a time to insure I didn't go over the cap. The game should disallow any signing, once the preseason starts, that will put a team over the cap.
As far as being able to release players, I think the problem is this: Where do you draw the line between freedom of choice for your team and big brother telling you what you can and can't do? It's a fine line, and I hope you can negotiate that line, JDB.