Allow MetaMask to overwrite nonces

[ghost]

When I use web3.eth.sendTransaction I can supply a nonce. I would like that this can also be used to overwrite pending txns. Currently, MetaMask ignores this request and simply creates a new transaction.

Suggestion: allow MetaMask to overwrite txns (or even add a "cancel" button to send a 0 eth self transaction) and add a warning to this overwrite: "You are overwriting transaction ".

[bdresser]

@MoonMissionControl we plan on adding a "cancel" button for specific transactions, as well as a "cancel all" to clear out pending tx.

Check out #3312 & #4022, as well as MetaMask/Design#25

Closing for now, but feel free to re-open if you feel like the above don't cover what you're looking for.

[monokh]

@bdresser This does address the issue from a metamask user perspective.
However some apps would like to provide custom parameters for the replacement transaction and for this they would need to specify the nonce. Metamask does not intend to allow this ability?

[C0deMunk33]

I would really like to add a cancel transaction button to my dApp, but to do this I need to be able to replace the tx with a custom nonce via web3.