While we are pleading for things, I'd really like to have BlockArguments on by default, as I use them all the time, and I really don't think that adding the extension to a module adds much information.
I realize that this is mostly a stylistic issue, and some programmers are going to prefer to write explicit parens, which is perfectly fine and in now way incompatible with BlockArguments.
Personally I like the extension because, while it takes a bit of getting used to, for me it leads to less syntactic noise in the code, which makes it easier to read and manipulate code.