Formula tokens on programs

In some case, after cloning a program, we may want the user to enter a few informations and, based on this, compute something more complex, such as Google "add to calendar link" (https://www.google.com/calendar/render?action=TEMPLATE&text=Your+Event+Name&dates=20140127T224000Z/20140320T221500Z&details=For+details,+link+here:+http://www.example.com&location=Waldorf+Astoria,+301+Park+Ave+,+New+York,+NY+10022&sf=true&output=xml)

So it may make a lot of sense to have a new type of tokens on programs : formulas.

-Greg