Hi i-liquidate,
While it is not currently possible to designate within your custom template HTML that the images which replace the [DESCRIPTION_AND_IMAGES] tag must always be paired, you could potentially prefill your template and Image Grouping in the lister page by building your listings from a Master profile that contains those details.
I see that you have already created a number of profiles from your account so I am under the impression that you are already familiar with how they work but, in case you need to refresh your memory, we have several tutorials that go over Profiles on the following page of our site:
http://www.auctiva.com/help/tutorials.aspxAs long as you save your custom template and the desired “Paired” Image Grouping in the Item Details profile that is incorporated into your Master profile that you build your listings from, those details should automatically be loaded into the lister page any time you begin with that Master profile.
-Mike