one feature that I think would be very helpful is being able to add different pages or tabs, like in an excel file for instance. This would allow the user to save different sets of dimensions in one single design file, i.e. one page for the jig set up, another one for the bike dimensions and a third one for the tubes.
Last week I took lessons on bicycle design and frame building with Andrés Arregui in Spain and we used BikeCAD to design the bicycles. During the design process I missed having this feature, since we had to save different files for different set of dimensions and measures. Having all of them in the same file would have come very in handy.