In the Task module lookup fields are not available.

There is only one "related to" field which I want to use for Company.

But I want to relate the task to another module. I can do that, through the "related to" field, but that means I cannot relate the task to the company. 

Only one relationship is allowed

How do I get the Task Module to allow additional "related to" options. 

Don't tell me it's not possible...! Because if that is the case it means the Task Module is inadequate....other modules can have multilple relationships, why not Tasks?