Is it possible to add a push button to an RF Standard transaction? and How?
SAP has provided Dummy screens to each RF screen for you to enhance it. They usually named as 'SAPLXLRF' and screen number would be 9XXX . 'XXX' being the original screen number. Then you need to activate the corresponding user exit that starts with MWMRF* for the corresponding screen. Also in the RF Screen Management you need to add an entry with Variant '1'.
Hope that helps.