#1
hey, I've been using a tremolo technique by pressing down the strings between the fretboard and the tuners, just about at the start of the headstock, because i dont have a whammy bar, so anyways just wondering could the sudden increase in tension on the wrong place of the guitar damage it
#2
nah It's perfectly normal, but its mostly used for bending or vibratoing open strings. I think, other than open strings you should use your actual fretting fingers to bend and vibrato much easier and more economic.
#3
No; Jimmy Page famously used that technique during the Heartbreaker solo.

Further, that's not exactly a replacement for a trem as a trem is more for lowering pitch than raising it.
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#5
Yeah lots of country players do this.....Johnny Hiland's PRS Signature model actually has a recessed trussrod cover so you can perform whole tone bends behind the nut...