The way see_pixels works is perfect behaviour except one fatal flaw:
https://u.pomf.is/haynrm.png - items which have pixel_x or pixel_y onto a tile can be seen through, even when that tile itself obscured. This could be good behaviour on some accounts, but is poor behaviour on others

The reason I'd like to use see_pixels is http://puu.sh/qp9us/edfc1648df.jpg - as you can see, the overlay, which should be obscured, is not, as the tile beside it has no luminosity, so it doesn't render. - if I could use see_pixels for this, it would be extremely useful

Perhaps an appearance flag could be added to objects that allows them to be either rendered on tiles which they are not on but are offset onto or not. - a sort of 'hybrid' for see_pixels and the normal behaviour, which would be more useful than the straight see_pixel.