interesting ideas you have here.

smn would prolly be the hardest kind of class to balance with the other classes due to its hybrid nature. If it was able to heal/buff/deal damage/debuff/possibly tank? If they do create this as a class they need to make its roll focused on just one or two of these things so it doesn't become over powered or under powered by other classes....

just look at the mess SE did with SMN in FFXI....Im sure ppl will argue this...