I've been away for a good year from the game, so I am trying to readapt to the gameplay. For positions, "DM" can play only as a #6 or can they be played as a central midfielder as well with no penalty? The same goes for "WM" can they be played as interiors with no penalty to their performances? Lastly, what is the penalty for playing "CF" as wingers?

I answered the same question here in this thread page 3
https://www.f4football.com/forums/threads/262?post_id=last

On an individual player's progress page, is the rating the combined skills/xp rating now used, or just skills? Also, on the same page, are the ratings showing for previous seasons just skills, or have they been adjusted for xp?

Will surely know that by pre season.

Bill Beaver wrote :
On an individual player's progress page, is the rating the combined skills/xp rating now used, or just skills? Also, on the same page, are the ratings showing for previous seasons just skills, or have they been adjusted for xp?

Previous seasons ratings shown in progress were not adjusted. I reported this to Tegimus, he said it will not be fixed since it will cause a lot of confusion regarding values especially when people look at transfer histories, team overall ratings etc