1. you have the factory anti-theft system, don't think it works like regular alarm.
2. service the 4R according to the manufacture recommended won't go wrong.
3. the 5 speed auto, which i think the D you can refer to over drive
4. do a search and i think there should be a pdf file floating here around the forum
5. i don't use additive, since i heard some additive will have chance to damage the fuel pump (at least it happened on my old integra once), so i just stick with some better gas