Auto mode for JACK latency is a good idea. I have another proposition: a dedicated graphical front-end for jack session. It could help users setup their workflow , by providing a list of all the jack aware programs installed, categorized by type (sampler, daw, synth). The program should aid in setting up a project , eg firing up ardour with several tracks, firing up synths (lv2 instruments/hosts incl) with presets selectable from the front-end with a preview sound. The front-end could trigger the synth in question with a midi note when selecting a preset. Lv2 plugins, that is pure audio effects, could also listed with the ability to directly send a signal from the audio interface through the selected plugin to quickly hear what it does. One could then associate the selected plugin with, say a track in ardour, and another plugin with a track in hydrogen or so.