i'm assuming it won't work with the manual trans because it would have to bypass the clutch to ignite the engine.
this was done on my friend's STi by an aftermarket installer, as far as i know almost NO companies offer remote start on a manual car from the factory, if i'm wrong, correct me though : )
you have to push the clutch to start a car, and i don't know about all of you, but i always put my car into 1st gear (or reverse depending on incline) when i park, then pull up the ebrake
to a corresponding tightness depending on the incline again. on my friend's STi the clutch was bypassed, so if he had it in 1st gear and started the car, it would jump forward a few feet,
maybe 5-7 feet or more, depending on how tight he had the ebrake (he demonstrated for me to show me why subaru wouldn't install it)
he said it would sometimes pop the car out of gear as well (he played around with it)
it's basically a CYA for the installer of the auto starter, and most will make you sign a waiver that you understand the risk involved with doing this toa manual trans car