Modify Parameters within a List

A question concerning the same script I posted yesterday. It takes a building massing, establishes a cutting plane from the bounding box, offsets it to get a ceiling depth and repeats the floor and ceiling up.

What I'm stuck on is modifying Floor to Floor heights within the set that it creates. The goal is a subscript that:

establish range of floors to change (i.e. 10-20) -> add a value to the spacing (+1 meter) and/or the floor to ceiling depth

all without repeating the original stacking script, which is what I had been doing and was horribly confusing and inefficient.

Any help appreciated.