1: Skill tool tips state how Aghanims scepter improves them, but not by how much. It should state how much the ultimate is improved by precisely. ie, if it were to add 200 damage, the tooltip should read "Adds 200 damage" not "improves damage".

2: When the flying courier returns to base, it stops directly over the shop,  often causing people to select the courier when trying to click the shop. It would make more sense to have it stop next to the shop, not on it.

3: In single draft games, it would be useful if you could tell what heroes your team mates had to chose from, without getting each of them to type it out, so you could draft a team.

4: When a hero can not be chosen due to somebody already picking it, or due to the game mode, the heroes portrait appears slightly darker. It would be more obvious which heroes could not be picked if they appeared in gray scale instead.

5: The hero portraits at the top of the screen should show levels on them, to save having to constantly open the tab at the top left to check peoples levels. It would also be useful if you could see your own teams hp and mana on these portraits.

6: When you hit enter to chat, having the ability to hit the up arrow key to type the last line of text you sent would be very useful, especially for missing hero calls.

7: It would be useful if you could check your current gold per minute (GPM) and Gold lost to dying in game, the same way you can check unreliable and reliable gold currently.

It would also be nice at least from my perspective to have HUD scaling options or some degree of customization.

I don't know if some people are against this notion but often I find my view of the lower portion of the screen quite obscured which I find frustrating.

In addition abilities such as Drow Rangers Frost Arrows have a Toggle option that doesn't involve clicking on the interface to improve real time management of these abilities.