Something that I have been wanting to see added for a while now, is the ability to add comments in between actions.
Sometimes I may have 20 or so actions within one event, and having commenting blocks between some of these actions would make it SO much more readable. When I am writing code the old fashioned way, I tend to comment almost every line and I really miss being able to do it in C2. These action comments would have to be added via the standard "add action" dialogue, which is somewhat at odds with the C2 workflow, but it should work fine.
Would also be great to have the option of changing the colours of individual comment blocks for further readability.