You can select which assets you want to sweep (btc or xcp or both) guess that other counterparty assets will show there as well. Should not affect your chancecoin as that is linked to your btc-address, you will keep access to the address, obly btc/xcp will be transferred.
ok i did that, still, don't know why it shouldn't be possible to simply import a private key, is there a reason? also i haven't found the export functionality as well, is there one?