For the emacs server we have command-switch-alist and
command-line-functions:
http://www.gnu.org/software/emacs/manual/html_node/elisp/Command_002dLine-Arguments.html

Why not apply that to emacsclient's "unrecognized" arguments?

// It could also solve this and alike(and it'l be useful for my personal
needs too):
http://emacs.1067599.n5.nabble.com/PATCH-add-emacsclient-support-to-open-with-file-linum-syntax-tp383378.html