<< No, actually as your placing the verts THEY ARE creating the 3d geomentry! >>
Errr, yes, this was already understood - as it’s the whole point of roughing a volume (say an aircraft fuselage … ex- r/c aeromodeller here) - but unless you have cross-sections at every position where there’s a (different) detail (often impractical) then features between sections have to be added afterwards to the geom created by bridging between the sections - I assumed you were talking about ‘cutting in / creating’ these details with a ptp approach.
Something like Clacos Draw Loop plug could be used to good effect in these circumstances - although Cut RMB is also quite useful (esp. if used with D on a group of edges)
pp