Thats a little annoying, oh well. The shots that do go straight seem to match the current sight set-up anyway, so luckily that feature is not really needed.
Yeah my fire selector does the same thing, although i have found with mine that if you place the selector half way between safe and auto, it shoots in semi anyway!
I cant say i have noticed the seam, it is there but it appears quite subtle on mine, either that or i'm just indifferent to it.
I've just sent my SLR off to have a systema hop bucking and a tighbore barrel fitted into it, that should easily be enough to sort out