Anonymus6,
Most decent training establishments will not allow you to commence training unless you have the MCC or an exemption due to previous hours in a multi-crew aircraft. And anyhow, you won't be able to have a multi-crew type rating issued by the authorities until you have either of the above.
If you are serious about getting a JAA multi-crew type rating, then getting a good MCC course will seriously help you on the type rating itself. Try not to think of the MCC as a "tick in the box" exercise......I for one found it a very valuable learning experience.
If you are keen to get employment, get the MCC done, and if possible try and get the USA security clearance started......when the upturn comes around, employers will want people asap.....the sooner you can start, the more likely you are to get that call!!!!!
Good luck!