Hi Dejan,

> Is is somehow possible to change colour of construction lines?

Yes, you can set the color in moi.ini, go to Options > General > "Edit .ini file" button, and then inside moi.ini find the [Drawing Aids] section and there's an entry in there for "StraightSnapLineColor" like this:

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


That takes 4 comma-separated values which are for Opacity,Red,Green,Blue - the values can range from 0 to 255.

That controls the color for both construction lines as well as the straight snap lines that show when straight snap is engaged.

- Michael