My old argument about this, when we were figuring out how {vIH} worked, was that we had a better mechanism for converting an intransitive interpretation with {-moH} to make it transitive than we had for converting a transitive interpretation (with {-egh} perhaps?) into an intransitive meaning, since things that move are not necessarily caused to move by themselves.

Doesn't always work. TKD told us ghor is break, but do I break an egg, or does the egg break? Then we got pIpyuS puS DaghornIS in TKW, and that answered that.

You got the answer for vIH by asking Okrand directly, and he told you it means be in motion.

-- 
SuStel
http://trimboli.name