Multiple Actor Selection: It gets really aggravating having to click, drag, click, drag, click, drag over and over when I realize I cloned something so far. It's even more annoying when I want to delete an entire row of actors and have to enter their actor control, click remove, confirm, and do it again... My suggestion? In Blender 3D there's this thing called box select with which you click and drag a box across the screen, similar to selecting in games like Age of Empires. When you confirm the box, everything in the box is selected! You can then deselect individual objects that were selected that you don't want to be selected. So perhaps a hotkey that enables/disables box select, and then the ability to drag the box AND the entire selection across the screen.
If this feature is already available, someone please tell me! It would reduce the amount of tedious work I have to do by a TON.
Highlight Selected Actor: Sometimes - especially if the box select feature were created - it would be really helpful if the selected object(s) were highlighted around their edges in order to tell exactly which objects are selected (as opposed to having to go through and read their names, as when objects are cloned it simply adds a decimal integer).
Import/Export Actors (AND VARIABLES) From Other Files: This is a feature I've searched for but have not found. The ability to pull an actor from another file! This feature would be so useful when making large games. I'm actually not sure if it's really available yet, but it would be great if it is! More than just pulling actors, though - the ability to link an actor from another file and all of his variables would be incredible helpful when making big games. This would give the ability to load, say, the coins count from one file of the game to another file while only using one variable. It would greatly reduce the script necessary for making something like that happen (unless it's already in existence). But like I said - not only being able to link actors and variables while playing a game, but also while making one. Pulling out individual actors and variables instead of having to copy and paste, remake all of the actions and reload all of the animations would be far easier! (Not sure if that last sentence made total sense grammatically, but I think you catch my meaning).
Script Editor Action: It would increase simplicity if there were a script editor action, rather than having to say "key down" or "draw actor". This way, we could define our own actions! Such as saying that if the left key is down, the character moves left. This would allow practically everything in a game to be script, rather than relying on just the premade options (the pre-made options are really good, but the ability to design our own actions with the script editor would be extremely helpful as well). The script editor actions would always be active, and would always require an "if" in the script, but this way we could create just one script for movement (if left=down, blablablah, if right=down, blablabla) and not have to go through separate key down events later on. If there's a way to do this already (without using draw actor or create actor), that would be pretty useful to know.
That's all I can think of at the moment. I really don't know if any of this would be simple or not, or if anyone else would find it useful, but I believe that I would! XD Thanks for the time you took to read this!