Script it, there is one you can use as a sample in this: http://www.neilblevins.com/blurscripts/blurscripts.htm James Haywood's scripts have it built into the SO level selection scripts http://www.jhaywood.com/maxScripts.htm
Hah, have those always been there? :) I've been using the Haywood scripts for a long time and it fit the need well. They respect an UnWrap mod and otherwise jump to the foremost edit/able Poly)... fit the need well enough I even know those were in the default list.
Look in Customize User Interface, there are hotkeys available for "next modifier" and "previous modifier", you don't need any scripts or anything. They aren't assigned by default. You'll find them in the All Commands list. I set "previous modifier" to A, "next modifier" to D, with S as "show end result toggle". That way I…