I don't think the artifacts (the green and purple blinking) in the top corners are because of the autofocus. They appeared even before I added the autofocusing. I just got used to them after some time.

The LEDs turning off and on is because of the autofocus, but that doesn't really bother me, because it helps finding barcodes even in the pitch dark (don't know why anyone would do that though ).

If we are able to implement our own autofocus that would of course be the best, but in my opinion it works pretty well now. It does at least take much less time to scan a barcode than when I had to click the refocus button earlier.