I would think it would be beneficial to have the vein pairs included in the Hosta database for the different varieties. What do others think? Yes or No

Yes.

I have no clue what vein pairs are. Perhaps you could explain what they are and how it might be beneficial to know - would it help in IDs, or for hybridizing, or...? (Obviously, I'm only a casual hosta person.)

Vein pairs help to determine the maturity as well as its identity. The petiole that extends into the leaf divides the leaf into 2 equal parts, on each side of the midrib are matching pairs of veins. To count the vein pairs start at the tip and count the veins on 1 side of the blade all the way to the base. Vein pairs are just another way to help identify a plant. It may not be worth it if it requires a lot of time to add to the database, there are other sources that have the info, like the Hosta Library.

Thanks for the info, always learning. This would not be anything I'd use (I just note the year I add a plant to my garden in My List) but perhaps it may be important to others.