FULL TIME to FREELANCE on TN VISA

I am currently on the graphic design TN and due to the economy, my employer has asked me if I would consider freelancing through them instead. Would this be a problem?

Also, if this were to happen, I am considering freelancing for another company and eventually switching companies. (would I just get another TN through them?).

I've read on some other forums that as long as you are not writing your own TN letter (self-employed). 1099 are acceptable versus W2s.

Your advice is greatly appreciated!