#1
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does not playing the muted strings in riffs make much difference in the sound? i've got some gnr tab books and some of the riffs have muted strings
#2
Just use your best judgment. I'm guessing it doesn't make a difference. Depends on what riff it is. If you want, you can type up the tab and let us look at it. What song?
#4
You can sometimes get away with just repeating roughly what came before it (like the A power chord in the case of 'Welcome to the jungle') but it won't always sound good. If you can't do the mute then the A5 is probably your best bet so long as you get the timing.
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