A simpler way that won't lead to back-feeding is to simply add a resistor in series with the wire(s) for the LED color(s) you want to dim. You might have to experiment with different resistances to get the desired brightness, but a 470 ohm to 1K resistor would probably work well. Go higher for dimmer, or lower for brighter. It's simpler, cheaper, and safer for the CPU (I don't trust those cheap Chinese ebay electronics), plus you can dim more than one color if you like.
If you don't want to cut up the wires to your LED, a compatible modular plug and jack could be used with the resistor(s) wired in between, and then just plug that in between the CPU and the LED.
Perhaps a future firmware update can allow a settable brightness for the LEDs, since the CPU or control set could just PWM them to change the brightness. Or take a page from the V1, Redline, and STi-R+ and add a light sensor to the control set and have the LEDs auto-dim.
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