I was wondering how you could handle lengths of edges or objects in Blender ? Where can you enter lengths of objects ?
I know how to size them, but for example if you are in subsurf mode, and you want 4 vertices to be a perfect square, where can you adjust the length of the edges for example to make a perfect square out of them ?
One method - In edit mode, Select an edge (Verts would be better IMHO), then press the n key. The transform panel works for verts, edges and faces in edit mode. When in object mode, the transform panel works on objects.
When in edit mode, go to buttons window, to mesh tools 1 pannel under editing. There you can set blender to display Edge Length, Edge Angles and Face area to help you with properly sizing the mesh parts.