I could disable spending double spends completely but it might be advantageous in some situations e.g. if miners consider the fees from an entire chain of unconfirmed transactions when deciding which transaction to eventually include in a block. SatoshiDICE seems to have fixed the double spend problem for now though.
If I receive a bitcoin transaction, Blockchain.info/wallet lets me immediately turn around and use that coin in a wager on SatoshiDICE (or any other transaction). What I am requesting is that when this occurs using the SatoshiDICE page, that if there is at least one coin that will be used that has zero confirmations then the user gets reminded somehow that these wagers made with 0/unconfirmed sometimes are invalid (as SatoshiDICE payouts will only confirm if the wager itself confirms).
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https://blockchain.info/wallet/login#send-satoshi-dice