I flew the Metro 3/23, -11 and -12's for over 2,000 hours in the great white north of Canada.
Some great advice given already. The continuous ignition is just as described above. I've seen it first hand how it works.
We used it all on pavement, in an airline environment. WAT limited during the summer, both take-off and landing. The 23-12's will obviously give some better numbers.
It hates the ice, and you will see your TAS drop by a good 20kts, it's time for you to leave. When the airplane gets loaded up with ice, you will get the tail wagging the dog effect.
The same applies with improper loading of the baggage and pax. A full bird will also try to control you from the tail.
Fly the numbers, and stay ahead of the plane, and you will be fine.
I've got all the FS study books, systems, POH, however I am reluctant to send them to a stranger over the internet.
Have fun with it.