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I miss the (ortho) line indication for precision slicing in graphic mode (keyless entry).
Check this video what i mean, extrude has it. And ThatOtherCAD has one too for slicing. Need to have
Some code like beneath. Lee Mac's grdraw function.
(while (not p1)
(setq p1 (getpoint "\nPick or specify start point : "))
(while (not p2)
(setq p2 (getpoint p1 "\nPick or specify end point : "))
(grdraw p1 p2 6 1)