I have lost count of the "new basilisk" threads. A search for "basilisk" will reveal several threads either specifically about, or containing discussions about the basilisk, on the first results page. They were probably worth reading before starting another one.
Anyway, in reply to your suggestions, the current gas range is usually sufficient for indoor jetpackers since basilisks can wallwalk to move closer to them. Colour changing to match surroundings would require much work, and would be of little use once the humans have helmets.
The one distinctive ability of the basilisk is to immobilize humans while they attack, and the essential skill needed to exploit this is to be able to approach humans without alerting them to your presence. I think that reducing the sound that a basilisk makes and/or reducing their visibility on human radar would be simple and effective ways of making this an easier task.
Whether the game actually needs this is a completely different issue though.
I CANT SPELL!!!!
So use the spellchecker.