In developing an application, I'm constantly testing code blocks and functions for proper functionality. Since the debugging features of Creator are limited, this often takes a while to figure out why something is not working correctly. There are many forum posts that could be answered if users had better debugging tools. Also, this would help new users teach themselves.
My feature request is to give the developers true debugging tools. Since I also code in Excel, I'm partial to its features: A watch window (where the developer sets some variable = some value), a local variables window (where we can see the current value of all variables), and step-wise code execution.
I'm sure there are other debugging tools people can suggest. Comment below with your ideas.