Is there any 3D modeling program (Blender, Meshmixer, etc.) that has this function:
- Select two points
- Give the program a dimension
- Program will scale entire model proportionally, so that the distance between those two points is satisfied?
Pretty much all 3D DCC (Digital Content Creation) apps will do this, yes.
Not sure about meshmixer - it's primarily a brute force boolean and retopo tool - it might have forced absolute scale tools, but I've not looked for that use in it - I just use modo for any real modeling work.
Hope that helps.