[Kong]

1. Nearly all systems of that era had add on controllers with turbo. So the fact that TG16 came bundled with one isn't much different than a kid getting a NES and turbo controller under the same Christmas tree.
2. 99% of RU users don't have access to a turbo controller. Allowing 1% to use them is very unfair.
3. The TG16 turbo controllers had an off switch. Even if you were using a brand new factory default TG16 set up you would still have to turn turbo on. Similar to how Contra came with a 30 man cheat, but you have to turn it on.

If a game has turbo on by default then you can use it but you can not use any addons to access it. Example Raiden will just let you hold down fire.