User Exit for Sap Script

Hi Experts ,

Below is my requirement .

My client wants to use the existing SAPScript ( i.e Cheque Printing Script- FI Module ) for on-site printing for different forms depending on some variables (for example - printer name or payment method supplement).

But the forms are defined in a static way. T-code F110 > Environment -> Maintain config -> Pmnt methods in company code -> Method C -> Form data.

Here my question is, is there a way to override the value dynamically at run-time using some kind of user exit?

If the User exit is not available then what is the proposed solution .

Here My Form is Zxxxxx Form ( Not Standard one ) But the print program is standardone ( RFFOUS_C)

Thnx

Venky .