I have 2 jack related pull requests up, both of which are really useful for me and I figure would be for others. One of them lets you set the name of pd's jack client and the other disables the automatic connections to the jack graph. This all came about because I wanted to run multiple instances of PD with unique jack client names to do processing of phone calls with asterisk. The automatic connections become tiresome if they're never what you want [though in the common case, they are.. just not this one].