If you need to do this please be aware that if you are not comfortable this, call futaba.

Is there any way to make the trigger tension harder, I have it turn all the way in and it's still pretty soft for me

Does updating the firmware on a Japanese 4PX change the telemetry voice from Japanese to English?

Does anyone know if the belly button switch that turns screen on when you touch it got addressed in this firmware update?
Thanks

Negative.

If enough owners made a request, it could easily be added as a parameter in the menus.

The language options still exist within the unit post update.

Maybe - however, I'd be concerned of something breakng if you tweaked it for more tension. Have you contacted Futaba to get guidance? They may have some thoughts/suggestions for you.

Receiver Futaba R304SB
 

Has anyone used the Futaba R304SB receiver for 1/8 offroad racing?

I have run it.

Yes, without issue.

That's all I use. Zero complaints, other than maybe an excessively long antenna.

Yes, and if your using it with nitro you can see you rx pack voltage on the screen.

Yup with an X-ray xb8 and no problems, just leave some antena cable inside the box for keepin it short and nice been wondering how the E version will work with my rally

I currently use an older Futaba 3PM. I know that the 4PX doesn't support the R603FF receivers while the 4PKS does.

My question is has there been any talk from Futaba about coming out with a version of the 4PX that will support the older receivers? Or, should I just purchase a 4PKS?

I don't think they are going to support the C1 receivers in the future.

Consider the cost of the newer receivers before making your decision. You might be better off with the 4PX in the long run.