Hi,

To produce documents in something approaching my organization's house
style, I need to be able to style the headers of tables.  It's nice that
orgtbl has the functionality for this, but the call to orgtbl-to-latex
has a hard-coded list of parameters with no possibility for extension.
With the attached patch, I am able to put e.g.

#+BIND: org-export-latex-tables-orgtbl-extra-parameters (:hfmt "\\multicolumn{1}{c}{\\bf\\color{white}\\cellcolor{blue}%s}")

in the header of my document, and tables throughout the document all
pick up this style.

I daresay that this is not the optimal way of doing things; while this
solves my immediate problem there is likely to be a more general way of
doing things.