Variable GUI interface on gmic [Wishlist]

I would like to be able to manipulate ranges via gui coding.

To clarify

#@gui Test=int(0,0,5)
#@gui Test2=int(0,0,$1+5)

Not possible.
For this kind of cases, you can usually rename your second parameter as

Test2 (%) = float(0,0,100)

and use then value_test2={$1*(1+$2%)} or something similar.