When issuing a new asset, is it expected that the transfer of the asset to the distribution account and the locking (setting weight to 0) of the issuing account take place in one transaction or, can the asset be issued and the account locked in a later transaction, allowing for more of the asset to be issued in the interim?
There are no specific requirements regarding issuing account locking. It's up to the issuing entity whether to lock account or not. Master key weight can be changed at any time, thus most anchors prefer to lock account only when everything was double-checked and the asset is ready for the tokensale.
Also consider changing account
thresholds instead of master key weight. If you plan to use
ALLOW_TRUST operation, make sure that your signers total weight satisfies the