Variable constants ?

I need to put a few bossiness constants, such as a labor rate multiplier in an
application. I am adverse to hard coding these things. The best plan i have
come up with so far is to store them in a table, which would have only 1
row, and a column for each needed constant.

Anyone have a better way to do this?

Failing a better way is there some way I can limit this table to only allow
one row to exist?


-- 
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
                        -- Benjamin Franklin