Hi! I've been keeping my eyes open in 0.x for small stuff that i think should be improved. Not full-fledged features, just smaller practical things that would make C2 a bit nicer and more effective to use. Feel free to add to the list (just keep it to smaller things to stick to the topic), I probably will add more things myself.
Comments should always be attached to an event, condition, or action. It's a pain to comment code, and then when you've worked with it a bit more the comments are all over the place and you have to redo it. Maybe attaching them to a specific action or condition is too much, but they should at least be able to stick to a specific event.
At private variables, the text "a private variable" is a perfect place to put a description of your choice on what the variable does. See no reason why this wouldn't be a good thing, i often use pv's for settings on a specific object where a description on exactly how it works would be really helpful, especially in collaborations.
System: Create, should have options for size and angle. Almost every system:create event is followed by another event setting the size and angle.