AKASupernoober

Basically, I have this thing that bugs me, whenever i use the pencil tool too fast, it makes it make diagonal pixels, like this But I don't want These kinds of diagonal pixels, I want every pixel to be connected by one pixel horizontally or vertically, like this. Is there some kind of filter that prevents these diagonal pixels, and makes it so that all the pixels are connected to another vertically or horizontally, instead of me having to go back and add the pixels manually.

Whenever i use the rectangle select tool on something with a transparent background, for example in the image i want it only to select the colors, but it also selects the background and whenever i put it near something else, the background cuts off a part of the other image due to the background also being selected, is it possible to make it so it only selects the image and not the background, even if the background is in the square? i can't just put the square on the exact image because sometimes i want to select multiple to not make my life a pain and it basically always selects the bckground, sorry if this is a dumb question