Would be very usefull to have a sign transaction method and select net

[denisgranha]

Hello!

I'm a full stack developer working for https://gnosis.pm/
I'm playing around with the Ledger Nano S and find it lacks of two useful functions for ETH:

1. Select network/Node to use for submitting the transactions or at least disable the function to publish to the network. In order to publish it with https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethsendrawtransaction
2. Sign single hash message. https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethsign We use this functionality to sign transactions and messages offline and offChain

Thanks