As far as I can see, the majority of people who are tweaking the rules are tweaking from the very beginning. "I didn't like the idea of X, so I changed it before we started playing."
To a certain extent I see this as both valid and invalid.
Invalid because I think you should test the current mechanic first. Just like Minigiant saying he is surprised that they didn't have two forms. It is only possibly invalid because he is just completely making something up instead of using the existing material. It is invalid as he is completely making new content or heavily modifying the existing material INSTEAD of removing or altering material already existing in the system.
A valid reason as I see it is when such choices are preference based instead. If Minigiant said that he was surprised that it didn't give him more complexity or that he dislikes at-wills or whatever then that is fine. But then, instead of making two different forms of the classes, he could just cut those elements and try the game. After, if he found it lacking he could try reintroducing them and everything would be fine. And if he cut them and the game still WORKED then he could report that too. How is that a bad or invalid choice?
I mean look at the stuff coming from the official wordboxes from WotC - like this for example:
http://www.enworld.org/forum/news/3...es-first-round-public-d-d-next-playtests.html
They want you to try variation. They certainly have ideas on how to do it but I think so long as the "houserule" or variation is something they can use that it ultimately works for the playtest.
For example, I have seen several instances of people trying to fix HP. Some will work for the system and some won't. You don't get into a problem trying new HP recovery options by itself. The game is capable of having any number of different HP formations and figures as long as those figures are universally applied to the game. The problem is when these "houseruled" versions are suggested as the core mechanic with disregard of how others see and operate the game.
The system itself couldn't care less if you got full HP after a full rest. As much as I have seen playtests where they have gone back to town to get healed up I can equally see them not doing so and running the game equally well. They may not have been in the same shape and been unable to counter the same enemies but the system would still have gotten the playtest. In fact the results would have been MORE useful as they could have reported to WotC that if you remove X mechanic then Y happens. Or that removing full healing on a nights sleep makes things more difficult but still doable, which is very valid information. Especially when you realize that a lot of people don't like the current form of healing and are looking for an alternative. WotC knowing that an alternative could work is invaluable as far as playtesting goes.
Just my two cents. Sorry about hijaking the thread Minigiant, I now return you to your regularly scheduled programming.