no, you do not want to use extra adhesive because then the two adhesives can actually act somewhat like a lubricant. The included adhesive will stick to the carpet and the extra adhesive will stick to the floor. These bonds will be stronger than the bond between the two adhesives, so the carpet can end up coming up. As long as your subfloor is VERY clean you should be fine.
However, carpet squares aren't always fond of water, which they're likely to see in an entrance way. Have you considered vinyl flooring or even Congoleum's Durastone? Actually Durastone would be great for your application. Looks like tile, is actually a very strong composite.
At any rate, yes youll want it under the threshold (the metal strip in teh doorway). Just pull the strip up - if you damage it you can get another one from the hardware store for a couple bucks.
You can do this yourself whether you choose the carpet squares or the durastone as long as you're very careful to keep everything lined up right.
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