I believe this is new to SIU as of 10.4.3.
You can now, when choosing the source for a Network Install, after clicking the ‘Customize’ button, select install options the way you would during a local CD install.
For the enterprise this is pretty nice – for example, at the newspaper where I work we have roughly 10 ‘remote’ offices connected to our core network by T1 lines. Removing the enormous number of unneeded printer drivers in the base install is quite useful in this scenario.