It may be very useful if "reference dimension" work like "constrain distance" if no constraint is selected. I mean creation of constrain and checking it as reference constraint.

Now if i have complex model i need at first check existing constraint as reference, then create new constraint, check it at reference and then check first constraint as "not reference" constrant. It takes lots of operations.

If i just create additional constaint without making the supplementary constraint reference than Solvespace hangs and program manager show me the constant growth of memory usage (i think it is some kind of infinite memory allocation).