Saving & loading formulas created with formula builder.

Hi, I'm testing formula builder component (http://www.smartclient.com/smartgwt/showcase/#formula_sumamry_builder_featured_category). Works fine, but I'd like also to provide functionality of saving (in DB for example) & loading formulas for further use. Unfortunately columns in formulas are named like A, B, C ... and this naming is related to their position. I'd rather prefer to have formulas defined on invariable system names of grid / db columns. Is it (or will be) possible to define formulas this way? Do You plan a further development of this feature or should I rather think about my own custom equivalent or some kind of workaround?

I'm using version 4.1, license - PRO.

Thanks in advance.