You may already have a smaller one... some of the machines I've used were stupid fast even with a smaller pulley. They'd sew quite a distance after you let up the pedal... The wheel on the end can be used to raise the needle or as a brake. As a rule, don't turn it backwards (unless the needle is going through your finder)... it cause messy snarls of thread around the bobbin. (If you already know this stuff, please accept my apologies.)
Not that I know of... masking tape would likely work. Zippers are a pain. If pins are perpendicular to the seam, you can usually just sew over them. Stitch Witchery might also be handy in some places (kind of like hot glue for sewing)... although I'd still sew it as well. For tough spots, you could tack it together by hand (kinda like welding).