Sigil Questions
1. No (if there the same named sigil, if different names then yes, exception stacking sigils)
2. Yes.
3. Yes.
4. No.
5. Entire bar I think, not 100% on this.
6. Not sure myself.
Re: #4 and 5, I’m pretty sure that it affects your entire bar, just like a Sigil of Force on one weapon affects the damage output of your other weapon (if dual-wielding) as well.