#1
I'm not sure why I don't know this.. but would you throw an EQ pedal in front of the amp or put it through the effects loop?
#2
effects loop works better.
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#3
I mean, eq is one of the things that can easily sound good going through either.
“In my anguish I cried to the LORD, and he answered by setting me free. The LORD is with me; I will not be afraid. What can man do to me?”
#5
I find EQ works better through the effects loop. You can put it in front of the amp, but if you're using distortion, I find it's better to shape what you hear after the signal's been routed through the preamp, instead of shaping the tone before it's distorted.

I would like to try two EQ's, though...one in front, one in the effects loop.
Amps
Randall RG50TC, Roland Cube 15x

Guitar
LTD MH-100QM, Washburn X12

Effects and Etc.
Ibanez Weeping Demon, Boss FV-500H, Ibanez TS7, Ibanez PH7, dbx 31-band EQ, ISP Decimator