I think the best you can do is download Electrum and import your wallet using private key (you can export it in Multibit).
Do NOT just sweep the private key though.
EDIT after that you will have far more control
Do NOT just sweep the private key though.
EDIT after that you will have far more control
Thanks, am considering doing this but should I wait until my stuck transaction becomes unstuck before importing the wallet? Or will this not make any difference?