you don't have to properly fill in either. you can use any name you like(hence jo,sue,doug stan and tracey etc - you could just use one letter)and for the e-mail address just put in one letter(any letter will do,a different letter every time if you like).
your automatic(autocomplete or autofill)depends on how you have your browser settings configured.
i'm not sure that it would be as easy as you suggest to ban an IPA.
I'm guessing that ash created this site as an exercise in programing,just to practise how to link a database with a forum with a blah blah,how to insert logos and links etc.
never finished(maybe never intended to be finished).
i,ve just been away and had me tea and realise that you will have said lots more but i'll post this anyway.
also,this is the only forum i've seen which will recognise html code,there are good reasons not to.