> Here's an example, which appears to show output modified as well.
>
http://www.ee.washington.edu/circuit_archive/circuits/F_ASCII_Schem.html#ASC
IISCHEM_008

After another look around (instead of going to bed, yaaaaawn)
this one also shows a trimmer on the drive (gate output) side

http://www.euroquartz.co.uk/pdf/application-notes.pdf

That's kind of what I expected, although the PIC oscillator
is more complex than a couple of simple gates, so I thought
it best to get some opinions. For example, I don't know
whether it best to load an output when I don't know its drive
capabilities. Although I might assume that being a driver it
should be able to cope with minor variances

I'm surprised (oh, really, why ? ;-)) ) that MChip didn't show
a recommended configuration, given that they detail every
other aspect of their oscillator sections

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