I'm stealing some ideas from Wolfie's post in the Remake VIII thread.

1) If 7 were remade, I would hope that Cloud would be made an optional party member by the point when he reveals how he knows Sephiroth to the party at Kalm. Forcing him on us did force us to appreciate his strengths in the original, but it'd be nice to have other options as party leader. In fact, I think the story should be tweaked slightly so that Cloud isn't turned to for every decision. Barret was the leader of AVALANCHE, Red XIII is highly intelligent, Cait Sith is a fortune teller, Vincent was a Turk, and Cid's a captain... in a game of rock, paper, scissor, Cloud ain't the dynamite!

2) Alternate outfits are always a plus especially in differing enviornments. Before traveling down to the Great Glacier, the group was at Icicle Inn. Why wouldn't there be a shop selling warmer clothes? Even if you were too cheap to buy them, why wouldn't Holzoff give you warmer clothes before you climbed Gaea's Cliff? I would especially love to see Tifa wearing that leather jacket she sports only in fanart. I imagine the disguise outfits acquired in Junon would be a permanent fixture in your alt outfits collection.

3) Obviously, being remade for a new console, as Wolf has said, VII would certainly sport a new dungeon. Well, I mean, is it really obvious, or is that just an assumption? I would approve it.

4) Definitely re-balance the materia system. Maybe rearrange which spells/commands appear on which pieces of materia. Something I definitely wish to see is the materia being dependent upon its TYPE rather than its COLOR to determine what is does. Partially or mostly because I want the Lavender materia to disappear. Introduce a materia that lets you dual-wield. It's a classic.

5) Make running the default rather than having to hold a button (or at least set an option in the menu to change it to defaut).

6) Summons, for which I have two options: I never appreciated the size of the summons cutting away half of the screen so I can't even see the enemies who are supposedly being attacked. So either the summons' size can be reduced, or the cut-scene by which they attack could be like 9 wherein you could skip the animation.

7) I would like a more in-depth version of the Fort Condor defense battles. Also I think FC should call Cloud up on the PHS to tell him there's an incoming attack from Shinra rather than relying on guesses as to timing.

8) The Costal Del villa. I think they should add at least one extra feature to this place. Why waste money on it if it just does the same thing any other inn will do for less money? Then again, if there is an extra feature added, buying it should cost more money. That shouldn't be a problem though. I would imagine the extra feature as the villa being the only place where you can change outfits.