Add "computed field" as an option in the field set-up

Currently we have a number of extensions running to perform quite basic things like creating a concatenated value out of values in other fields.

It would be great to have the option to program a computed field similar to how you program a custom function in syndicate; a window in which you can enter your formula and a second window that shows the real-time result of your formula.

An additional fancy feature could be that when you start inserting field ID's a pop-up comes up where you can search & click the one you want to prevent typo's or needing to have list with the exact field type id's at hand.

For relatively simple formulas/functions I could handle this myself as a system admin.