Add the ability to create a calculation in a value box based on existing tags. For instance, in a grid this would provide the ability to divide the value in column 1 by the value in column 2 and show the result in column 3.
If I can add on to this. Creating a GUI to assist in basic math calculations, similar to the GUI used when using the trend control would be a huge help. Having to working in the scripting environment when doing simple addition or averaging of tags is tedious and time consuming.