Every SAP system has only one dispatcher and message server..you can't increase them.. A SAP instance can have only one Dispatcher.. Instance is nothing but group of services running together and are dependent. Every service correspond to a port like Dispatcher port is 32XX, and you cannot start two port with the same instance profile i.e you cannot start 3201 and 3202 from same instance profile, But same you can start 3201 and 3202 with two different instance profiles. So technically it is not possible. See the very concept of dispatcheris to dispatch request and roll context to workprocesses, ensure availability of work processes and many other task. Similarly msg server is used for interinstance communication. And icm & gateway have similar task.
There is no point or scenario that may require extra dispatcher. That is why SAP had designed its system and instance concept for distibuted communication with providing scalability.
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