This project uses a pseudorandom cyclic sequence I came up with a few years ago that generates numbers in a fixed sequence from -2147483645 to +2147483645 (excluding zero), but in an order that appears random. SEE PROJECT: http://scratch.mit.edu/projects/11480048 for a test of the distribution of the generated numbers.
>> UPDATE << fixed slight mistake when returning integer values from "pick random () to () with seed ()" custom block. --- In order for this to work it has to multiply some numbers that would normally overflow Scratch's digit precision limits. So I had to create a custom block which can cope with that. Unfortunately, because there's a fair bit of messing around with numbers in here, and because Scratch is fairly slow at interpreting script, it means this is very slow compared to the built-in "pick random..." It still generates thousands of values in a few seconds, though (but with the list showing it'll be even slower than that)...
