JonLouis
My multi-engine hours are only around 20-25 and in a PA44.
If you had this problem in a piston twin provided you could reduce the RPM to no more than 10% overspeed I would definitely leave the engine running. Any useful power is better than no power at all, plus you still have redundancy with vacuum supply, electrical and possibly hydraulic power.
Ask the pilot who ditched a twin in the Irish Sea a couple of years ago whether or not shutting down the first engine was a smart idea, after feathering a runaway prop she then subsequently suffered a partial power loss on the other engine. Sure there were other considerations here as well, like possible finger trouble and not bothering to consider driftdown to a landing on terra firma.