Regarding Cloud Feeds for credit cards, you can deal with unimportant and common vendors, like gas stations and convenience stores in a way so as not to overload the vendor list.

If the payee is not important, you can create a generic vendor for this purpose, say Misc. Charges, and tie all the imported expenses like gas, convenience store charges, etc. to this vendor. It is a good practice to mention the vendor in the description when adding this credit card charge to CORE. 

Note: Only vendors of type Consultant and Contract Employee show up in most drop-down lists. So you might want to tag this generic vendor as one of the above two types so that it appears in the Cloud Feeds and other drop-downs.