MISCALLENOUS:
-Pls increase the primitive shapes by default.
-Pls add fill holes. Sometimes it is very difficult to find which face is missing especially when it is tiny little surface amongst hundreds of others. There is a plugin to make “co-planar faces”. If it is not coplanaer then it doesnt close. But it is not what i need. Just close the holes in the mesh. Blender has it. Closing holes are not limited to closing coplanar edges. Closing means abslutely closing. There should be an advanced algorithm for this. Closing a curved face doesnt mean merge the vertexes so it is done. It should analyse the edges and try to recreate the form while closing. Same like Curviloft by Fredo. but it must be doing this automatically and repeated as many times as it is needed no close “all” the holes. If you are trying to do this by even curviloft, it is a real pain.
-Clipping issue in close distances and when your model gets bigger (as i said above).
-Precission should be increased for engineering desings (presently Sketchup is not as suitable as Rhino/Solidworks or other CAM softwares)
-Organic surfaces and sculpting ability should be there (sandbox tools is very primitive in comparison to 3ds max/ Maya / Blender or even Rhino)
-Surface deforming tools must be there (physical deformation such as wood, stone, tiles, floor, wall, and many others. I will say same like in Zbrush but it will be too much. Just give the primitive ones. Parametric would be wonderful!)
-Physics engine should be integrated.
-Is there a chance (i dont know actually, i guess SU team already doing the best) to utilise more CPU cores (it gets really annoying when you turn on and increase “Profiles” under styles menu in complex models (not big models but complex models even small ones)
-Pls try to integrate “real view” (like in Solidworks or inventor or that kind)
-Pls integrate a rendering engine like Cycles in blender.
-Pls try to integrate “pipe routing, cable routing” (these are just names. They are not only to be used to route cables or pipes. They can be used in many different ways by users.)
- NURBS edit should be integrated.
This is it 
I hope we can soon see some of the above developments…