It's totally possible, I did it on my GSR. I wouldn't recommend doing it unless you already have a habit of putting your car in neutral and pulling the e-brake when you park, rather than keeping it in gear. Your just asking for a disaster to happen if you put the car in gear and want to get a remote starter.
Or, you can spend the extra money and get a Compustar alarm/remote start combo. Those can be installed in standards legally because there's a specific process you need to follow to get the car to remote start:
-You park your car and leave it running.
-Put it in neutral, take your feet off any pedals
-Pull the e-brake
-Get out of the car, while its still running
-When you close the door behind you, the car will shut itself off and arm the alarm itself, too.
When that process if done, the brain knows the car must be in neutral and will allow the car to remote start. There may be other companies out by now that have a similar fail-safe system to have their starters installed in manuals, idk. But I know at least Compustar does.