hi, i’m really glad to read this :). btw welcome to BA (i’m a new here as well).
knife is in edit mode under Slice > Cut (it’s the default blender’s knife - pretty good). what do you mean by bisect? i somehow missed this tool in max
EDIT: bisect is not in last official release (2.68a i guess) and i’ll stick there for a while. i’ve totally misunderstood your question - i see you already know about the knife tool :oanyway, it’s there
bmax is basically an “in-house” tool, so when it evolves i put the updates online. sadly i can’t tell when this happens, since it’s current state is “in-house” sufficient.
probably no, because blender exposes only simple menus (as i get it) and to create a quad menu would require some direct opengl access/rendering approach which would probably break things sooner than sticking with what blender exposes to add-ins natively.
totally off-topic: your avatar is hilarious