That's interesting you went from Dealer.com to Dealer Inspire. I started at our group just over three years ago and about two months in "we" made the change from Dealer.com to Dealer Inspire. I was too new and was far removed from the decision to have any insights as to why, but I presume cost was a key driver. The few times I had to work with their support or our Performance Manager it was pleasant.I used to have the shortcodes readily available and would have been happy to share, but we've since completely migrated off Dealer Inspire and over to Dealer.com groupwide...
My advice - ask support to create a page for your most advanced use case (one that would require a comprehensive list of shortcode parameters). Then you should be able to gain a good understanding of the shortcode parameter format by looking at the page they created.
That's a good idea to scheme up a complicated page to get the information I'd like..