If you mean pressing a certain button or ENTER on the first screen of the transaction so that you script the first screen, then yes: in the above linked thread, the example contains pressing a function key on top of populating the screen fields.
If you want to run an entire transaction after specifying the selection screen values, then it's still possible to do this but it's a little more involved. In this case, you'd have to create a flavor for the transaction to be executed and add a script to the selection screen which takes care of running the entire transaction. This script would then be assigned to the OnCreateHandler event of the selection screen's User Area which will kick off the script once you start the transaction.