#1
Yes I have in fact used the search bar, but to ask you directly...

I'm buying an Ibanez RG3EXQM1 this week. Nice guitar IMO. Plays great.

Now the tunings I used and still use are Standard, Drop D, Drop C, and Eb Standard. I hear that changing tunings can screw up the neck? I play heavy songs to the blues (at coffee places).

So is it still all right to change tunings, even frequently?
Gear:

Guitars:
Takamine Gs330S
Fender Standard Stratocaster
Ibanez RG3EXQM1
Epiphone SG G-310

Amps:
Crate Palomino V16

Pedals
Ibanez TS9DX
Line 6 Tonecore Uber Metal
#2
Yeah it might put some strain on your truss rod, plus you cant like the gauge strings that you use in standard at Drop C as well, there is too great a tension difference between the two relevant tunings.
#3
not onley will it strain you rneck but your strings as well....