1) no but i feel like i have better control with a baitcaster
2) the basic rule is baitcasters like heavier lures. The newer high end baitcasters cam throw just about any weight lure but most finesse fishermen use spinning reels.
3) You could use a spinning rod but they are not designed for baitcasters and you would look mighty funny doing it.
And to add... once you are proficient with a baitcaster you will never want to go back! (You may get the occasional backlash but you won't have to worry about freaking line twist every again!)