Yes, you can changed.
Yes. Spell check will stop at every instance of a misspelled word until you tell it not to. Repeatedly stopping for the same word is a waste of time, when the feature can deal with them all with one click. The first or at least by the second time spell check stops at the same word, choose Ignore All if the word, such as a proper noun, is spelled correctly
Static Spell Checker do not provide adding word. The Dynamic spell checker provides it.
No. But spell checker alerting to you for correction or ignore
Yes. Static spell checker provides change all facilities
Yes. Dynamic spell checker provides it
Yes.