This seems to be supported now. Individual ERC20 tokens are listed underneath the Ethereum balance. But the total wallet value (ethereum + sum of ERC20 tokens) is not given.
What I think would be good with Ethereum wallets is for there to be some sense of hierarchy in the accounts list. The total wallet value could be a top level balance and then there could be indented rows below the total wallet entry which contain the etherum and ERC20 token balances.