still can't really help with your question(s), but just wanted to sing the praises of serviceberries a bit more. my neighborhood has a number of VERY productive bushes in public spots, and most people assume since they don't really recognise the the fruit, that it's not food...leaving my friends and i with access to gallons and gallons of the fruit every year (so much so that they are frequently referred to as 'freeberries')...the fruit is delicious, kinda like blueberry applesauce, with hints of vanilla...very nice.
pretty easy to see why they aren't really a marketable fruit variety, though. the berries tend to separate from the stems when picked, leaving little holes which make shelf life really brief (and shipping impossible, i'd guess), and the seeds are just large enough to be pretty noticeable...i've seen some blueberry devotees turned off by the 'coarse' seeds...but since the seeds are where the tiny bit of vanilla-ish flavor come from, i've got no complaints.
actually, especially with the help of the heap of wild blueberries we picked not long ago, and since we still have bags upon bags of serviceberries in the freezer, it may be about time to convince my dear wife that we're due for another freeberry pie.