The current toolbar in the game isn't very user friendly as users are left to guess as to what button does what and even hovering over the toolbar buttons doesn't help much in many cases.
If you make your own ship, setup your own toolbar and use that ship regularly you probably won't have too many issues remembering what button does what but if you are using a ship someone else made it is often a guessing game of how to use it.
The problem is especially bad when using certain blocks like for instance the Program Block. A program block that is set to run with a string or that is set to run with default arguments displays exactly the same with the same icons. The user has no clue which is which.
I would like to suggest a new toolbar in which the user can add a short text description of what that button does that is displayed underneath it and also choose from a bunch of icons to better represent it.