Is it possible to apply Direct Modeling features for X-Solids in Bricscad?
Yes, it is possible, but after this kind of editing X-Solid's history will be lost. User must confirm he/she wants to do that.
Move cursor on face you want to edit and choose editing option from 'Quad' you need.
Confirm you want to purge history of X-Solid's creation and apply changes using Direct Modeling features.