A third option needed for an add-to-cart button.

OK, the web store theme area gives users the ability to define a "dense list" add-to-cart button AND a "regular" add-to-cart button.

see...
SetUp->Site Builder->Themes->Default Theme

What if we need a 3rd button?  Is there a how-to available for that?

We use the standard NetSuite "dense list" button and "regular" button.  One is huge and only works well on the drilled-down item detail page.  The other is small and works on "dense lists".  We need a third one for "graphical item lists" that aren't marked as the standard NetSuite "dense lists".

I'd be happy to use the "dense lists" button in these templates, but it won't function in the template unless the item is truly a non-graphical "dense lists" (NetSuite limitation).  So, is there a workaround?