After reading this post, i got this idea:
very small range around an unbuilt hive: can use Hive 1 weapon (so a gorge can heal when it's the last hive)
very small range around an active hive: can use Hive1, Hive 2 and Hive 3 weapons (so a gorge can use web, but only at the hive location)
medium range around an active hive (including spawn): can use Hive1 and Hive2 weapons (so a skulk can leap around the hive)
So, the more the aliens is near their hive, the more they are dangerous.