Certain fractions of coconut oil are good for brewing and will hold hormones at a higher amount than GSO or CSO. I've never used coconut oil in gear but have used avocado and like it much more than GSO or CSO. I've heard good things from the people who have used coconut oil with gear though. Also I'm not sure on this but would think the solvents(ba, bb, eo) would be enough to keep coconut oil liquid at room temperature. If not, you could simply hold the vial in your hand until it was over 78 degrees and you'd be fine.
Part of the reason pharmaceutical companies don't change their carrier oil is they would need to prove it safe meaning a new round of trials which are expensive. Since they can't patent injectable test there isn't enough money in it for them to switch to a different carrier. Whats used by pharma isn't always best today though it may have been at the time of creation.