hmmm, I asume you want to presign the transaction and then later move the asset? correct? if yes I doubt there will ever be an operation like that, because lets say the user has 1 XLM today and 1000XLM tomorrow then all 1000 XLM would be moved. How does he agree on a transaction like that?
I'm interested in those kind of usecases as we develop different smart contracts as our main business on https://smartstellar.org