For developers... these are small changes that will massively affect overall quality of gameplay, a nice polished feeling.
Of course these aren't my own ideas, but they're way too convenient to leave unmentioned.
1st off, the courier needs a transfer items button. The existence of this button attributed to the only reason I ever purchased a courier. When I found in HoN the lack of such a feature, I was sorely disappointed and felt let down as in DotA I HEAVILY rely on it.
2nd, this is more of a personal request, not a priority. Players should be able to incorporate their own personal banlist within the game, so they're not forced to play with leaver/lamers/grievers over and over...
I know I had more suggestions but I seemingly forgot 'em. Well, I'll add them as I remember them and I encourage forum users with similar small yet groundbreaking ideas to post them in here.