On my keyboard layout, square brackets
 require very inconvenient key combinations,
Alt Gr+5 and Alt Gr+6.
@3ventic, in the comments, says that for his (Finnish?) layout, it's even a triple:
Ctrl + Alt + 8 and Ctrl + Alt + 9.
Because of this, I often end up pasting raw URLs into comments instead of making them look nice and fancy using linkified text.
In addition to the standard Markdown, please also accept an alternative notation for linkified text, for example
See <the manual>(http://www.example.com)
See (the manual)(http://www.example.com)
or, in keeping with the notation for E-Mail recipients:
See "the manual" <http://www.example.com>
It would make things much easier for those of us with non-English keyboard layouts, and it's extremely unlikely any existing content would be adversely affected by this.