#2
yes
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#3
Yes it can
It's a matter of string gauge sometimes too. You'll find that lower gauge strings won't hold drop/lower tunings as well as higher/thicker gauges.
~Vince~
Fender MIM Telecaster ('06) [Modded]
PRS S2 Custom 24 ('13) [Modded]
Squier Affinity Fat Strat [Modded]
Yamaha F310

Mesa/Boogie Lonestar 1x12 Combo
Mesa/Boogie Mark V:25

SD Vapor Trail
Xotic SL Drive
Xotic BB Preamp
Boss BD-2
Boss DS-1 [MonteAllums]
MXR 10-Band EQ
#4
Yes, but if you want to keep this tuning I strongly advise adjusting the truss rod so your r neck isnt ruined.