Do I get double the conquest points when crafting

You're correct in your assumption that they do not share the "feelings" or affection statistics.

1. There is a limit to one Cartel Pack or Gree Reputation "spaceship pet" and one non-spaceship (creature, droid) pet out at a time, in addition to your active companion. There is no effective limit on how many you can own.

2. They cannot be levelled or upgraded at this time.

3. The training droid is an item rather than a pet, and does not join in combat but simply can be used to place an effect around your target. There are no pets that provide combat damage or anything outside of audio/visuals at this time, and doubt they will add such features since our companions fill this role.

These items are mostly for visual appeal and to add to the game world, possibly for role-play elements as well.

Hopefully this answers your questions Matthew , may the force be with you....

As a rough rule of thumb, every 750 affection is worth roughly a 1% reduction in completion time on crew skill tasks.

Edit: Comments indicate that the first 450 points of companion affection are worth 2% off the top, and that further affection follows the 1%/750 formula. I haven't seen the exact data set, but this does fit the patterns I've seen closely enough to be plausible.