I would still like to contribute money to my existing 401k, since I already have a significant amount in there. Is it possible to make extra contributions to this 401k plan, other than a payroll deduction? If this is possible, is it okay ethically (since my old employer matches contributions up to a certain amount and I am not really "working" for them anymore)? Or is there any way to transfer the old account to an IRA or my new employer (or is my old benefits dept. correct)?