I ask because on virtually every project, I find it is necessary to change the default settings of these items to a different value, typically the same on every project. For example, the default setting for Line Size is 1, which produces a line that looks the same as Size 2 on the screen, but is barely visible or not visible on a PDF or printout. I usually create Areas where a Border Size of 2 is needed. View>Properties>Precision default is 0.000001 m, which is 1 micron! Which means that running Normalize Topology on a default drawing tends to not bring line end points together, so Join Lines won't work, until I change Precision to 0.5 m or greater. Using Snap addresses part of this issue. Almost every drawing I do is in the same projection, which requires changing it from Orthographic to a different projection.
I typically use the same set of scales, which are based on 1"= 100 ft, 1"=200 ft, 1"=1000 ft, 1"=2000 ft, or their equivalents in Mercator since I use Virtual Earth images as backdrops. The Mercator scales include a correction factor of about 15% at 30 degrees N, to give a printout at about the same scales as above, thus the scales are odd ones like 1:1380. These scales are handy when using printed maps in the field and using an engineering scale to measure distance on the map. Being able to have those as defaults in View>Zoom To would speed up workflow.
Copying and pasting layers or .map files with the desired settings from one project to another helps, but doesn't address all of it.
Although I am currently using Manifold 8, at some point I plan to migrate to Manifold 9, and the same issues seem likely to occur with 9.