We will write a script (smart contract) for you

Smart assets can be used in the following cases:

Freezing assets: It is similar to keeping the assets untouched for a particular interval of time or for a certain height, This is useful in case of having multiple funding rounds.
Whitelist/blacklist: Giving the possibility to allow/deny making a transfer for specific addresses.
Taxation: The issuer can get a share after each transaction.
Multi-signature: It's a digital signature scheme which allows a group of users to sign a transaction, It requires another user or users to sign a transaction before it can be broadcast onto the blockchain.
Controlling Asset Pairs: Tokens interchangeable with a certain currency only.
Gaming: The smart asset can be used to transfer an asset only under certain conditions (holder has a certain attributes in a certain location).
A token that indicates some commitment/debt (unburnable, may only be transferred back with permission of the issuer).
Require asset's owners to use a specific matcher.