Move with dimension, how about addition/subtraction?

[gawdzira]

I just tried to input (-18) to get a wall to move 18" rather than doing some simple math. I do actually have the faculties to subtract 18" from 10'-7" but to be honest, I don't want to do the math if I don't have to. (While I am being honest, that is the reason RISD and Pratt were my short list for architecture school, neither required Calculus)

Is this something that there is a preference for or would other people like to be able to type in "-17" in the move object using dimension dbx?

Thanks for listening (errr, reading...),