Oh please You absolutely can connect isolated vertices to a poly, just use the graphite tools Op.
1) select the vertices you want to become your new polygon and go Graphite Modelling Tools > Cap Poly
2) Graphite Modelling tools > Freeform > Step Build. Then hold shift and drag the cursor around the vertices you wanna connect to generate new faces in that area (common practice in max retopo work).
Might be more ways too, but that are the ones I use and are aware of.