Data element selector in Launch custom code

[#1]

I often reference data elements in custom code through _satellite.getVar. I'll be in the middle of writing custom code and realize I need a value from a data element. Since I have a lot of data elements, I'll have to leave the rule entirely, find the DE I'm looking for, and copy the name. I would like to pipe data elements directly into custom code with a selector similar to the way variables are set. Selecting a data element would insert it into custom code through the %dataelement% syntax or satellite.getVar syntax

[#2]

Yes, we should do this