Added <unique> to mappings, stop overriding existing
Adding more <unique> to mappings
Changes <leader> from ',' to '\'

Commas (,) is already in use for inline char searching.
No more <silent> mappings

If you silence the commands, how will you educate the users on how to use Vim
more wisely?  Seems like a good idea to let people know what is going on under
the covers as much as possible.