What makes for efficient Wyter-casting is totally different from what’s efficient use of regular Rune Magic - it’s all about that multi-targeting, which in turn means that buffs, heals and the like are the strong powers for a wyter.
If your Wyter has some resurrect spell (one-use is fine), it can chain-resurrect dozens of people after a fight for a very reasonable cost. Extension is incredibly boss as it doesn’t care about the regular lock-up of RPs - while 15 POW is a large investment, it allows for a Shield 5 + Extension 5 cast on 26 clan warriors, for a year-long Shield 5 effect, something that should be very useful in a war, for the rather moderate cost of maybe 2% of adult clan members having to sacrifice a point of POW to fix the Wyter up afterwards.
So yes, that Detect Enemies use works along the same lines.