Well, right now you can sustain some nyeth effects and get some pretty good effects when combining them with an unarmed combat style. Of course the damage is insignificant when compared with the kawu versions, but other non-damaging secondary effects are quite significant. I actually don't have much experience using the kawu versions yet, but I guess mana and consequently time-per-damage cost keeps things in check there? Dunno.
The non-explosive sustained touch-enhanced playstyle heavily favors quick attacks, even before considering that it only works with HtH strikes. In that regard it's quite expensive mana wise for what it offers though. Once you add the proc requirement to use your fists.. well, it is literally a monk niche. I'm not even sure if it works with elbow/slam. (does it?)Again, that's fine, it's just a playstyle (and inferior to the bursty explosive playstyle). But should we open it up to other options?
How about foci weapons that don't allow for kawu nyeth combos? Or the foci needs to be enchanted with kawu to be able to deliver only one kawu attack? That way the big melee + big nuke burst damage is kept in check and the burst-ability is moved to the preparation phase (like everything else mage-y).