That’s right.  AFAIK there are only four polysyllabic verbs known:  {ghIpDIj} court martial, {He'So’} stink, {HoSghaj} be powerful, {nughI'} twist knuckle into someone's head.  Hmm… perhaps “bisyllabic verbs” would be better.  Did any more appear in the last two or three qep’a’mey and qepHommey?

nughI' is a term borrowed from English, so I don't count it among the "legitimate" polysyllabic verbs.

qep'a' 27 gave us the slang word Hampun yodel. qepHom 17 gave us the onomatopoeias ghughugh growl and Qoghogh snort (like a pig). That's as far back as I'm going to look for now, but I seem to remember Qoghogh breaking the long dry spell of new polysyllabic verbs. And none of these appear to be normal, straightforward verbs.

Oh, and don't forget lo'laH be valuable, which I believe Okrand said isn't necessarily just lo' + -laH.

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SuStel
http://trimboli.name