Instrument can optionally define whether issuance transaction is supported. If set to true, issuance instance is also granted the admin role of the Instrument Escrow, which means issuance instance can also operates on the assets in Issuance Escrow. This is useful for issuances that want to deposit its locked assets into third-party protocols such as Compound. However, this is only an experimental feature and is not used by existing financial instruments.