Hi,
I found a thread about this in the general questions forum but wanted to add a formal feature request for it.
Would be very helpful to be able to save a document as the default startup document.
Bidule has this implemented very simply with a menu item:
[Edit / Set current patch as default]
and if launched as a Rewire slave:
[Edit / Set current patch as Rewire default]
This makes good sense for Numerology as well since your configuration could be very different in each case.
Cheers!