yes, but not via m2u as you can't overpay using m2u.

It depends if you are freeing your CL or if you are going to swipe over your CL.

Example:

1. CL = 5000, you used up 3000, you want to swipe 6000. You have to make your payment of 4000 using CDM.

2. CL = 5000, you used up 3000, you want to swipe another 3000, just pay 1000 via M2U.

what do u want to swipe? buy online? can try to swipe whether can get successful or not.
Maybank allow some buffer for over limit.
U may call to Maybank to check.

Three choices to overpay:
I) CDM to own credit card account
II) Use other people's Maybank account to pay to your credit card
III) IBG from other bank's account to pay to your credit card

Yes, you can transfer the fund to the person and ask the person pay your credit card.

Is your payment a single payment that straight away exceeds your credit limit?
If otherwise, you can really consider pay the outstanding through M2U as and when it appears in your outstanding balance. Then use it for the rest of the payments, provided you have easy access to internet and available cash, that is.

I know that requesting temporary credit limit increase would require you for strong justification, but there is no harm trying.