i already made a secure new wallet and moved all coins. but i am not sure if i will receive any payments on my old wallet.
Yup that was the consensus of what to do when I had asked a similar question:
is it possible to "move" the addresses to my new wallet - AND to make sure the private key in my old wallet can not be used to do any harm?
There is a patch that will allow wallet import, but I don't know if those are considered in the keypool just like an address added normally, and thus puts you back where you would have coins going to an address that is not secure. Here's the pull: