I was around at about 03, on and off, on a different account.
I participated in MANY threads, that actually involved devs posting in, during the development of TES:IV. I remember talking specifically with MSFD about the magic system. People were requesting the ability to shoot more than one spell at the same time, people requested the ability to be able to shoot spells without having to put your weapons away, things like that.
As far as combat goes, I can't really remember a whole lot. I remember a LOT of people complained about the compass though, when it was first revealed. They thought it cheapened the game, before they even played it. :rolleyes:
A lot of people requested fast travel, too. Now it seems like everyone is against it. I remember some just random request too, in the threads I participated in. Some like:
~Target dummies that raised your skills in weapons
~Dummies that you could put your armor on as a display
~Mounted Combat
things like that. Good times. Too bad the game turned out the way it did