From version 1.5.9 on BC Vault desktop application will detect ERC20 tokens residing in your Ethereum wallets and offer you an option to add definition for those tokens automatically, so you do not have to do it manually any more!
Option is available under "Settings", "Add/Modify ERC20 Tokens":
Application will look for tokens you hold and display the definitions found:
After clicking on "Add definitions" custom ERC20 token definitions will be added to the list. You can always manually edit, disable or delete them.