> I can have ZTree look check for notepad specifically, and drop into the
> same code that runs when the length of the command line would be
> exceeded, thereby opening one editor session per tagged file.

I've done this in the past: download some Notepad clone, rename it to Notepad.exe
and overwrite/rename the original. It does not break any associations, tools,
paths, variables, scripts, etc.

One can't know how many ZTree users do that, so their "Notepad" may suddenly
switch to several instances instead of opening multiple tabs. Just a thought.