The wide Mustang seat will move you forward, maybe an inch. It seemed to be a bit thicker, but didn't feel like it affected my footing at red lights. I just got into the habit of sliding up to the tank at stops. It's the only time seat height was ever an issue. For me the 950 was still light enough to push back on my toes. I also added inserts to my riding boots which gave me a bit more "leg length". There are also shoe repair shops that seem to be opening up at a lot of malls that resole shoes, some of them may offer a thicker sole. I'm going that route also.
I too am a 30" inseam, but never had issues with the forward controls. I used Baron risers to bring my bars back a bit and when I add the Mustang, my ride was perfect. It is more like a saddle and you sit in it, not on it.
When I got my Strat, I had to have my seat customized and it moved me forward 2" and lowered the seat by 1.25" Doing this only cost me about $250 more than Ultimate seats would have been and I got the color that I wanted for that price.
Lowering the bike has it's own set of problems and although a lot of riders have done this mod, it may or may not be for you.
There's not going to be a perfect solution. I read on one of the discussion groups that Yamaha design their cruisers around someone that is 5' 9", but you should still be able to dial it in without too much expense.