If a false positive occurs, the easiest way is to submit the affected file to virus@avast.com (preferably packed with ZIP or RAR and protected with a password); the file will be checked and if it's really a false positive, it will be fixed. False positives are not a "normal thing", so we certainly won't include an "Ignore" button because of them, that would be too dangerous.
Also, you can put the troublesome file into the list of avast! exlusions (you are interested in the Standard Shield exclusions, I guess) - it should get rid of the warning. However, we would appreciate if you could send us the file so that we could fix the problem.
Regarding the virus report - well, I think you don't have to fill the items you don't like, do you?