Features presentation
Editing in 3D viewport

CGS wrap merge brushes, faces, edges, vertices, clipper points

Insert brush vertices arbitrarily

Delete brush vertices, edges

Extrude brush face inside, mass extrusion of selected brush faces (ctrl + alt + m1)

Simple arch creation
Using extrude (ctrl + alt + m1), wrap merge (ctrl + u), direct vertex edit (alt + m1).

Mass extrusion of selected brush faces (ctrl + alt + m1)

Texture UV lock during vertex editing, transforms repeating (ctrl + r)

UV Tool on brush faces, copy, paste texture seamlessly (m3, ctrl + m3)

Brush <-> patch seamless texture paste (m3, ctrl + m3)

UV Tool on curve

Some editing techniques

Use of curve.thicken

Brush.autocaulk

Creating curve of brushes (extrude, merge)

Bending patch pipe by Transform tool

Snap selection bbox corner to pointed position in scene (m1 + ctrl)

BBox rotate-snap (m1 + alt + ctrl), move along plane (m1 + ctrl + shift)

Creating brush arch via CSG Tool and texturing it simply by seamless texture paste