Sorry about the late reply
Your 2 questions are a bit vague, I'm not sure how to answer. By scaling do you mean zooming? About dimensions, they are not enabled or disabled, you need to add them manually, being in the sketcher or the draft workbench. About the squares, it depends on how they are created (sketcher or draft).
In any case, you'd probably better have a look at the documentation: https://sourceforge.net/apps/mediawiki/free-cad/index.php?title=Main_Page
About pycam, i don't know which formats it uses, but FreeCAD exports to many well-known formats (step, iges, obj, dxf, etc..), surely there is one that works.
Hope it helps!