[R] Manually setting coefficients in an lm.

[COLLINL at pitt.edu]

Greetings, I'm working on a project where I want to hand-tailor an lm. 
Specifically I want to construct an lm with an existing formula and then
hand tailor the coefficients myself.  Is there an established method for
that other than manipulating the $coefficients values?

     Thank you,
    Collin.