This is not an oversight, for the record. The race was suggested and deliberately added without a gas giant restriction. As far as I know, it should be the only race other than Toydarian without this restriction. A few races were later added without it but were quickly fixed since the Diathim terrain restrictions were mistakenly pasted into their fields.Edited By: Syn on Year 19 Day 66 22:48
There are currently no specific plans to add or modify gear like that, to my knowledge, but to be fair, there aren't a whole lot of concrete gear plans at all, so it's certainly not outside of the realm of possibility. As for the question about avoiding damage, although there are currently no items to prevent environmental damage on a GG, they can simply board their ship before the 23:00 tick and unboard after it and be unharmed. Obviously that's a workaround, but there are currently a whole lot of pending issues with environmental damage anyway (it doesn't affect anything but PCs, and only at the tick, not upon unboarding/stripping out of protective gear, etc), so I'm sure this will be revisited at some point.
At least streaked velkers can't drop eggs anyway, so without a Diathim/Toydarian hunter you're only missing out on a trophy.