Originally, this was going to be a post in the main MD thread, but since that thread was already waay off topic to begin with (originally it was a "Which Pokemon are you?" thread), I thought I'd post it here.
What changes do you want made to Mystery Dungeon 2, were they to make one?
They need to remedy the difficulty level of the boss battles for MD 2, if there is one. Really, those things are easier than some of the single Pokemon battles on the way to them. I beat Regirock in Ancient Relic just recently with a few Sticks and Flamethrowers- the other team members (Shuppet and Absol) didn't do squat. The Explosions were annoying, though.
That, and the escort missions can leave permanently, or at least get some smarter clients. Seriously, the clients in those things are suicidal or something, wandering off while you're busy trying to defend them from something else, getting in a battle (usually with something they're weak to), and going through all your Reviver Seeds before you can come and rescue them, thus screwing you over, usually at an inopportune time in the game. You don't even get the Rollcall Orb till after the main storyline, which is what really bothers me- if you could buy those during the main game, it might not be such a bad thing (Yes, I have used Escape Orbs, religiously taking one with me every mission, in fact, but to have a client whose friend is on B25F go through all your Reviver Seeds and force you to Escape on B24F is rather Sisyphean- "I have to go through all that AGAIN?!" Cue cursing from Neku. True story. Not as bad, though, as your stupid Minun client running off and getting KO'd by Spinarak while you're trying to bring him back over to the Plusle 10 squares down.)
The game REALLY needs to fix its resource system. Losing items after failing=annoying, especially after spending 8000 Poke on X-Ray Specs (which are the greatest hold item EVER for item junkies/escort missions). The money penalty's not so bad, but losing items can stop.
Finally, more constant shop stock. Yes, I know constantly changing stock is kind of another opportunity to strategize, by means of resource management (should I buy this item to use later?), but a few necessities that are always available (Reviver Seeds, Oran Berries, etc), alongside specialty items (Pecha Scarf, most hold items) would be nice.