addmultisigaddress creates an address respecting the setting, being unable to generate a specific type of address without also adding it to the wallet seems wrong.

I suppose in the future `addresstype` may be refactored to be wallet-specific, which would leave this non-wallet rpc call without an argument. Perhaps there should just be an optional parameter to set it.
{
    
    if (IsCoinBase() && GetBlocksToMaturity() > 0)
        return 0;
    CAmount credit = 0;
    if (filter & ISMINE_SPENDABLE)
    {
        
        if (fCreditCached)
            credit += nCreditCached;
        else
        {
            nCreditCached = pwallet->GetCredit(*tx, ISMINE_SPENDABLE);