Is there a tutorial on how to mod snap!?
No
........
Ok 
hopefully someone makes one
The best tutorial is just reading all the large comments at the top of most of the javascript files.
Ok takes a lot of time but I’ll try ot
its kinda hard to mod snap
the code makes your brain hurt if you dont know javascript
also most of snap users only use blocks, they cant write actual code
Snap! blocks are really code. The block format is just “syntactic sugar”, so as not to scare away those who are prejudiced to assume programming might be, well … scary.
"Snap is scheme disguised as scratch" - the snap devs, @bh I think.
… and even Scratch blocks are really code.
oh yeah of course.