Car Alarms: installing, manual override, mazda 929

Question
there is a way to manually overried the system. And there is an antenna like wire comming from the brain, is that for the distance range? can i make it longer by adding extra wire? and can i add on other accessories like the sunroof close/open? i have many questions srry. LOL
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The text above is a follow-up to ...

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how would i go about installing an aftermarket alarm without a Valet switch...the car is a 1993 Mazda 929? thakns
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I am not really sure what you are asking here.  Do you have a system and it is missing the valet switch?  If this is the case, what is the make and model of the system and I may be able to get you one, or provide a link online for one.  They are less than $5.00 at most install shops.

If this is not what you are asking, please elaborate more on your question so that I can attempt to answer it.

The alarm system is this...go to ebay and type in 250075186387 this is what i have...it has no Valet switch....but it comes with everything else needed..all the plugs go in and none are missing but i notice it did not have a valet switch nor a slot/plug for one.
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I checked out the auction.

If there is no standard valet switch, check the installation/owner's manual for some type of manual over ride.  If the system does not offer one, I would be hesitant to install the system.  It does not take much to kill a transmitter (drop it in a puddle on the way to the car and it's done), and if you have no way of manually over riding the system you will be stuck.  

The picture in the auction does not show any type of valet switch and the antenna appears to be a wire hanging out of the brain (some systems incorporate a button in the antenna).

Answer
As long as there is a way to perform a manual override if need be then I would say go ahead and install it.

No, you can not extend the antenna, in fact if you do you will probably kill the range.

Yes, you can add a sunroof close/open module if the unit offers some type of external output like a channel 2 or 3.