To the extent that you are trying to be genuine in your proposal, wooI_Ioow, I am not really clear how such proposal would work exactly.

Theymos and moderators are not bots, and it does not even seem to be a great task for a bot to attempt to determine exactly what rises to the level of a violable offense.  There is a certain amount of human discretion involved in terms of whether proper credit was given, or if the plagiarizer was stealing the ideas of someone else without giving proper attributions.

Plagiarizing is likely most frequently caught these days by using bots to see matching text, but human decision making would be necessary to determine if the non-attributed portion rises to the level of plagiarism, and I would imagine that it if the case is somewhat ambiguous, then a lesser punishment will be given than to ban the account.

Anyone in the business of taking the text of someone else and then jumbling up the words or changing some of the words, might be able to meet some kind of minimum threshold in terms of the number of words that were changed, but that still could be considered to be plagiarizing.. discretionary, like I mentioned.

Let's say that you have rule that says that if any string of text is less than 30% matching then that is not plagiarized, so then the copy pasters aim to change 70% of their text in order to be within compliance... ... I must say, this is sounding ridiculous as I am attempting to describe it... because I can see that there might be a whole 100 words, and 70 or them have been changed, but 30 words are still identified as stealing words ideas and not adequately attributing.  Same thing if you have 10 words, but only 3 of them are the original words, and the other 7 were changed, that would still be plagiarizing if those words can be identified as being taken from someone else and not attributed.

Personally, I believe that if someone is a long time member and they are in the habit of contributing to the forum and one or two posts of theirs are found to NOT have proper attributions, they are likely to be given more leeway than someone who is brand new to the forum, so in that sense, it seems to me to attempt to develop a decent reputation as a good poster on the forum in order to lessen the chances that anyone is going to report you for (or accuse you of) plagiarizing. 

Furthermore, just continue to work on your English and your typing so that you do not feel that you need to use the words of someone else (without attribution)... And if you do use the words of someone else, error on the side of giving attributes.... so that it is clear that those are the words of someone else.  The more that you practice giving proper attributions, the easier it will become to do that.

I have had more than 21,000 posts and surely a lot of words that i have posted over the years, and I have never been accused of plagiarism (or failing to give proper attributions), but I bet that if you looked at every one of my posts, there are going to be some examples where I did not give proper attribution.... I am not saying that I am excused, but I am saying that sometimes people can make mistakes in terms of sometimes not giving proper attributions when they should. 

Accordingly, giving proper attribution is something that each of us should always strive to achieve, and some of us have to work harder on making sure that we make such proper attributions as compared with others in order to be able to post our own ideas and sometimes to share the ideas of others by saying that we are getting those ideas from some other poster (or other place on the internet) and some of the ideas are ours and some of the ideas are coming from another source (and attempting to fairly identify that source, too).