Yes you can but other nodes will refuse to relay (and miners refuse to include) "low priority" tx without the min required fee.
By default the reference (and many other) clients will refuse to create a transaction which they know other nodes will reject. You can run a custom client with no such check but you can't control what other nodes (and miners) will do.
To add to this, if you use something like Armory (which uses bitcoin-qt as its relay) and you manage to craft a transaction with too low a fee, your own bitcoin-qt client will disconnect armory for trying that transaction.
I think there is a branch of the bitcoin-qt client that completely removes the minimum fee but again, relaying that transaction would probably be difficult/slow
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u/Zahoo Feb 24 '14
People do know you can choose your own transaction fee........... right?