To me, canon is each and every details which remained unchanged the longest. If you want to rewrite the rules, write your own rules for your own universe. Don't like the classic Constitution class? Don't play in the 2260s. Don't like the colors of the classic Enterprise's bridge? Don't use the classic Enterprise bridge as a setting in your story.
What does respecting canon mean? Same thing respecting another man's house means. Can't leave it alone? Then stay the f*** out.
"Now I did a job -- and got nothin' but trouble since I did it, not to mention more than a few unkind words as regard to my character, so let me make this abundantly clear: I do the job... and then I get paid. Go run your little world."