FYI, VoiceAttack is a powerful and versatile input modality that works with any module in DCS.
The link provided by MustangSally is for Hollywood's Vaicom app which, as you'll see on the linked site, does awesome things as a pluggin for VoiceAttack. Not sure if its adapted to the F18 yet.
Anyway VoiceAttack as a stand alone app is worth a look as well.