#1
Is it ok to use a standard dc adapter from somewhere like radio shack with effects pedals?
#3
generic ones are usually noisy little buggers, but yeah if everything matches up use it.
i used to be a mod, then i took an arrow in the knee.
#5
Yeah should be fine. Don't mess up the polarity though, guitar pedals tend to deal very badly with it and you could easily turn a $200 overdrive into a $200 paperweight.