What does "0.5 feat progression" mean? I'm not familiar with any controls named anything like that.
The following code is put into an Eval Script on the configurable. The Eval Script button is among the blue buttons at the top right of the editor tab.
Code:
field[cfgMaxF1].value += round(#totallevelcount[]/2,0,-1)
The settings at the top of the eval script:
Phase: Post-Levels
Priority: 10000
Index: 1
That will give you a feat on this configurable every even level.