Let me take a stab at the "bend thing". You can bend strings on any stringed instrument. Period. What you hear however, may not be musically pleasing.

What Rob was referring to happens with vibrato bridges. On these bridges, the strings are tuned by tension. YOu have to keep going back and forth between them to get them tuned, because different tension on the string pulling at the spring stretches it, then everythign else goes out of tune.

So when you use your fingers to bend two strings (say one going up a whole step and the other a half step), the tension on the springs increases, they stretch slightly, and the remaining strings sound a little flat. With a fixed bridge (no springs) you don't have this problem.

Makes sense??