I'm trying to create a list of functions,
calling them and see how far I am progressing.
It's actually probably supposed to be a list of copy commands,
but I haven't gotten that far as of yet, so I'm using "sleep" as a placeholder.
My issue is that I'm unable to create a list of functions with a different number of parameters.
You can't, because you wouldn't be able to call it item.1(); just doesn't make sense semantically when item.1 takes 1 or more arguments.
Your alternatives are
Try to find a common signature for all functions, for example fn(&[&str]). In that case, each function gets a slice of &str as 1 argument and has to do a length check at runtime.
Use some type hackery with HList, which will result in very unreadable and unidiomatic code. See frunk::hlist - Rust.