Toyota VAST VR sensor vs Crank Trigger?

[dcg9381]

So I've read over the information provided by lance and other contributors:
http://www.megamanual.com/ms2/vast.htm

I'm doing a 1988 Toyota 4runner (22re) that uses VAST as OEM.

Some hardware changes are needed to accept square wave 12v.

Output again requires some harware changes to provide enough current to the ignitor (depending on MS version)

It is interesting to note that the ignition system should start and run with base timing, without any signal... A good starting point.

My relative newbie questions are:
1) Is there any advantage to running a crank triggered sytem (hall effect) with more teeth on it other than increased resolution and timing accuracy?

2) Will a typical hall effect crank trigger system require hardware changes as it's not square wave?

Seems to me that you could almost build a plug and play adapter between megasquirt and toyota TCCS (other than dealing with the OEM tach).