I've updated my suggestions for 3DC:

1) Extrude tool
Thinner red line
Green square replaced by a crossair
Crosshairs and line keep the same size when zooming (no getting bigger)
Image for xz plane
Pre-defined shapes in xz plane (rectangle, cercle,… ; very useful for shapes like circle; less useful for a rectangle)
Possibility to add a point on an existing red line (at least in the xy plane)

2) UV Map / UV Remap larger window

3) Key to quickly change view (with 3DC 7 responding quickly, I generally use one view and I switch from one view to another one). Keys L, R, T, B, P seem to be free.

4) Chamfer box

5) Group selection tool with lasso

I forgot this one:

6) Boolean operations don't reset textures.