You don't talk about more branches the better in 4 in 1 trees- you just don't have a choice. I hate these trees- they are a virtual impossibility to train well. Each variety has it's own level of vigor, but in Asian pears and peaches this might not be as big a problem as with apples. Apples are all I have experience with in this form. It looks like branches were already cut back for shipping. What you need to do during the growing season is keep the 4 different varieties growing at about the same pace so one doesn't dominate the tree. I can see that will be an issue for the peach for sure, with the top branch in position to dominate. Pinch growth that eminates from where branches were cut to encourage dominance of a single leader while developing less vigorous (smaller) secondary branching off it. Each variety should be treated like an individual central leader tree in terms of form. The central leader being like a trunk with smaller branches (no more than half diameter) coming off it. Also pinch back as needed to keep the different varieties in balance. Pinching means that you're removing as little growth as possible to stear energy where you want it, so it won't really retard overall growth. If you let the trees go without guidance for even one season you may loose control with certain varieties dominating the tree and starving out other varieties. Anyway, that's my opinion. My experience is primarily with 4in1's that have been badly trained and I have to try to straighten things out later. I would never produce a tree like this, much better to alternate varieties by tiers off a central leader, placing most vigorous varieties at base. In other words, new varieties are grafted as extensions of the trunk as the trees grow up. This wouldn't work well for peaches, though.

Azaleas have growth buds all along their stems just under the bark surface - new growth will sprout from just below any cut you make. I think you'd be happier with these in their setting if you didn't attempt a formal sheared hedge approach, better would be to selectively prune stems to the height you want. Cut back a little lower than you want the plants to grow, healthy well established azaleas will quickly return to their pre-pruning height. Your azaleas have set their buds for next Springs blooms, so be aware that while it won't damage the plants, pruning now will remove most of the flower display for next season. The ideal time to prune is immediately following Spring flowers.

do you have a pic of your wisteria in bloom and in late summer? Looks like Amethyst Falls can grow here in IL since it grows in your area. :)

I would NOT eat it. There are many members of the Apiaceae. Not all are palatable and some are toxic. As far as I can tell it isn't parsley, cilantro or chervil. Carrot seems the best bet so far. Being able to smell it would help.