If it is your account and you care a lot about it,
don't risk it.
I have 3 accounts in total from the past banned,
I know what it feels like.
The account I plan on atm (Look up alexis xxxx), I auoted my magic 55 - 82 to be honest without getting caught, but there were many times where people said things like "Nice auto =P", "woohoo, which auto alcher?", etc.
Surprisingly I havent been banned yet.. But that was last year and I don't plan to take risks like that again.
(Not sure if this is still true) Whenever you report someone for something, Jagex usually sends you a new message saying something like "Thank you for bla bla bla..", something along those lines, confirming that your report went through sucessfully. Try reporting everything against the rules you see, you'll notice that most of them Jagex are too lazy to take a look at..
About auto wc'ing to 99, I wouldn't do it also because of the fact that people can walk by and report you.