The easiest way I find to bring in vibrato for a solo voice is using aftertouch. That way you dont need to take your hands of the keys - just press a little harder. You can also edit voices on some machines to have delay vibrato which would only occur on long notes. I find this quite effective as long as you don't overdo it.

I also use a programmable footswitch for the pitchbend on my Ketron but I prefer the wheel for better control (speed and depth)

I agree that the use of these controls make a far more realistic representation of the accoustic instruments. I don't think it matters which method you use as long as you personally feel comfortable with it. Haven't Roland got some unique "V" controller that you wave your hand about in front of?

Keith