well... we also aren't that good with checksums...
some times we may find or recognize some checksums but that's about it
the only checksum i figured out while others failed (at least those who tried) was the one for operation darkness
most of the other ones are either just standard crc32 or simple checksum
there is not much to figure out on those... just find them and fix them ^-^
if you want to create one of the newer games
then pick one that might be good to edit and we could make one together or you could also ask jappi to create one with him if you want
i don't think that he will refuse ^-^
or if you want to do it alone you could create one regardless if someone else already working on one
yours might end up better ^_^
and if the game does have encryption or checksum just ask around some might be able to help you out (i think you know that already) ^-^