I greatly support this idea. RTCs at current can be pretty difficult to write for complex controls. The biggest short coming of current RTCs in my opinion is that variables can only be defined once in the RTC and can't have their value changed after that.
The RTCs are also very slow to open and use once there are a fair few of them, and copying RTCs can take a fair while just to open the grid view. Having external script files would greatly help in productivity and shifting between models/databases.
