Autopage RS-850LCD question.

OK, i got the autopage 850LCD installed in my car (Mazda Protege5) and a have a few questions.

I want to install a perimeter sensor, the autopage RS-32 found here http://www.autopageusa.com/autopageusars32.htm How hard is that going to be to do this myself and where do you think is the best place to put this perimeter sensor? under the carpet between the two front seats? or the steering column?

Also the manual does not describe how to program the system to do auto start based on the temperature. Any ideas? 

As well, I want the doors to be locked automatically after i start the engine (manually, not using  remote start) and open the doors after i switch the ignition to OFF. Any ideas how to program the remote to do these things?

My antenna is mounted on the windshield at the middle top. I am planning to put a metalic tint across the top of the windshield to try to improve the RF. Do you guys think this is worth it?

Thanks,

Manokat.

Can anybody help the programming?