[HusarDerLuft]

According to Billfish, the guru on the Ki-61, there should be extinguishers in its fuel tanks. In the game it is located in the engine, which is incorrect.

The Avia biplane has automatic extinguishers. I don't know of any other aircraft that use auto-extinguishers.

I don't believe the Zero had any form of extinguisher, at least not the early models, but I could be totally wrong here.

I have not tried the ILS for any aircraft, but it apparently works for the He-111 ( green dot instrument )

You are partially right.
The A6M5b and onwards had them installed in the main tanks. I read it in a pretty cool encycolpedia of planes I got.
This particular model was shot down in great numbers during the "Great Marianas turkey shoot" - perhaps you have heard of that event.
(though no fault of the aircraft.. it was mostly the inexperienced new pilots)