Angle Snapping for Straightedge Lines

Hi, I am a STEM major who uses OpenBrush for scientific drawings. It would be great if there was a setting to snap the x, y, and z angle while drawing straightedge lines so that I can draw accurate perpendiculars in scale drawings.

I’m using OpenBrush for multiple projects so, even if it’s not polished, I’d appreciate a bare-bones version whenever it’s ready… I’m happy to beta or alpha-test.
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