Currently when you add a new Reader/Writer you need to hard code the connection parameters, the process then uses that information to connect to the database allowing you to then specify the Feature Types to be included etc.
I would love to be able to specify scripted parameters when defining new readers / writers. Seems silly that i need to first hard code them and then replace the values later with scripted versions of those parameters. This becomes a huge issue when I due to incompatibilities between reader/writers versions that are embedded in the FMW, requiring me to re-create them. Instead of being able to just link the new reader writers to my existing scripted parameters I have first hard code them, and then later replace those values with scripted versions.