Hi Tom, some info on point size here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9360.8

For construction line color, that comes from this line in moi.ini:

[Drawing Aids]
<...>
StraightSnapLineColor=103,0,0,0

That's 4 values from 0-255 for Opacity, Red, Green, Blue

- Michael