I doubt it'd increase in size for a few extra lines of code, but who am I to say, I have no knowledge in what programming language Avast was made in in the first place. Adding the features wouldn't really equate to eating disk space anyway, as it's made to be compact in the first place.
Anything like Norton deserves to be shot. Not only is it bloatware, it's also actiware (you need to activate it online before it'll begin to protect your PC, and if you don't update its definitions, it kills itself), and basically a pile of crap. Avast does the job x times better and comparing it to Norton is just stupid.
However, should Avast have such a feature added in to reinforce what it currently finds I think would be ideal for a lot of standard users and I believe that it would make the software more popular. However, we don't really have a say in that. I voted yes mainly because of the idea, however, that doesn't necessarily mean I totally agree with it, as even I feel Avast has got enough to make the 'typical' user satisfied (I use the term typical to define the technical users overall here).