Thanks for the lead .. and yellow1912's "Using one single listing template" post is a terrific one.
...but my issue is pretty much the opposite - the template format i do **NOT **want to adopt site- side is the one accessed at "Admin->configuration->Product Listing".
My preference is just the opposite - to apply any one of the templates used for "new products" or "special Products", etc.
The reason is that i find the template that yellow1912 adopts site-wide to also be the least flexible as its more rigidly table-based. Better to use one that's not table based so that we can have greater control through css.
Someone in that post also mentioned that version 1.4 is likely to adopt a site-wide unifom template - which would be terrific ....but lets all pray that a rigidly table based template is NOT the one the choose to apply.