Currently there is only one post calculation. It's a pain to keep reconfiguring the calculator. This could be a data store like most other things in GEMS where you can make a new one, edit them, pick which ones are active or which to run after a simulation. For example, in the model I am working in, there are multiple things I sometimes want to calculate averages on, like average pressure over a simulation or average flow delivered from sources. The post-calculation goes in different fields and tables. So maybe a "batch post-calculation processor" where it remembers or can remember calculations you have saved.