I can actually see the value in being able to adjust both left and right side separately. It makes setting the kerning much faster.
I guess for me, another option would be the search function. Currently, if you search a letter, it brings up pairs with the letter being the first of the pair. It would be great to see pairs where the letter is also the second. This helps me when I make a change to a particular letter and want to make kerning changes to anything to do with that letter.
Also, going back to kerning classes. It would also be great to be able to copy any and all kerning values from one letter to another. For example, if you’ve completed all values for letter “T” (both as first of a pair “Tx”, and second of a pair “xT”), I want to be able to replicate it to a similar character “Ț”