My inseam is 27". My very first motorcycle is an FZ07 which has a 1 inch higher seat, but also I set the preload much higher so the bike doesn't sag when I get on it, hence, its even higher for me.
I learned at the start to just keep one feet down. I never have two feet down at a stop. Plus the very first week I had it, I went and purposely found all the conditions that I needed to get used to. Luckily my neighborhood is quiet, and it has A LOT of steep hills. There is a bunch of houses also down a steep hill. What I did is spent the first day stopping and going on a hill. Stopping right smack on the downhill (that is the hard one). I got used to it. Also cambers, find cambers. Once again, I had no trouble finding cambers in the road. Obviously try to find and practice where it gets steep on the side you put your foot down. Also, be sure to alternate which foot goes down so you will be used to having either feet planted down.
Once I got on the R3, man, oh man, I feel planted! Hahah, I know. Its all relative. That's the problem. I'm sure if your first bike had a higher seat, and THEN you get on the R3, you'll also feel much more confident as well. But I will say my wife is 5'3" and I taught her the one feet down, a year later and its completely natural to her.
Now as far as low speed or u-turns, there is a few things. First, when your steering locks to either side (it turns as far as it can possibly turn) this is a recipe for disaster in low speeds. The bike will just want to fall down. A mistake people make when doing u turns is locking the steering and right away, the bike will probably drop. Don't lock your steering when you do u turns. And this is a sport bike with clip ons. The low speed maneuvering is bad. You will fight the bike to keep it upright. How low the clip ons are, the angle they are placed, the fact that some of your weight is on your wrist. These all contribute to bad low speed handling. Now, relative of course, it is FAR better and forgiving than an R6. But you get on a naked bike, or a cruiser and they are so **** easy to maneuver relative to the R3. Its just the design of the bike. The more aggressive your seat posture, the worse the low speed handling is. The more stable and planted you are at high speeds (sport bikes with fairings), the worse the bike handles at low speeds. The better the bike handles at low speeds, the worse it handles at high speeds. Its just the way it is. Get on a motard or dirt bike, those things you can ride around at 5mph all day like a bicycle, but no way in **** you want to ride 100 mph on it. Its the trade-off.