If you want remote start on your manual transmission vehicle with your alarm your gonna have to go to a an alarm/stereo shop. Z Auto Sound on Stevens Creek does great work and Jim (the manager) is a good guy.
Do your research before hand (price out the alarm installed at Best Buy, generally the best price) go in know what you want, tell him your a friend of mine, with the yellow mazdaspeed and he should give you a fair price. I got them to match a best buy sale price installed which is pretty good since they don't do nearly the volume that Best Buy does on the product and their labor is more expensive.