Situations arise where it would be useful to enter data on the command line, and elsewhere that manual data entry is needed, as the result of a formula calculation rather than as a discrete value.  Currently I have not found a way to do this. 

Is such a feature available? and if so how is this accomplished?

A specific reason for the need is that I can write separate commands that contol the cross-hair cursor size where each command inserts a discrete value but I cannot write a single command that toggles between two (or more) values because the command line fails to recognise a formula that is needed to achieve the toggle.  This significantly reduces the advantage of being able to create commands that have the capability of stream-lining aspects of using DraftSight.