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That really depends on how and where they are planted. If in the ground, 2" of water a week. If in a container, they will need to be watered once a day normally and twice a day when the temps go above 80F.

I am not sure...I think this is more a matter of individual perception. What one person smells will be different than what someone else smells. I do know that borage plants are said to both taste and smell like cucumbers.

They technically can in milder climates but do not often come back a second year. In moderate climates, they sometimes will reseed themselves. It is best to plan on them only living the one season.

As you didn't mention what the root eaters look like, this is some general information:
https://www.gardeningknowhow.com/plant-problems/pests/root-eating-insects-identifying-vegetable-root-maggots-and-root-maggot-control.htm

Pansies can pretty much take care of themselves in the cold. watering the ground before a particularly cold snap can help prolong them a bit when the really cold weather sets in, but other than that they really need no special care.

While I personally have not heard of this, one never knows so it doesn't hurt to try. As for issues with raccoons or opossums, these articles may also help with suggestions: https://www.gardeningknowhow.com/plant-problems/pests/animals/getting-rid-raccoons.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/possum-control.htm