You can send your BTC away after 0 confirmations if you export the private key and use any other wallet. This is really easy so everyone should be able to do it.
no wallet will spend non confirmed transactions.
You will need at least one, otherwise double spending would be too easy
?? What are you talking about?
Every wallet I use allows that. Its not double spending its a chained transaction. And all of those can be included in a block without a problem.
Right now I am using trezor with mytrezor.com but blockchain.info custom send can do the same.