In simple terms:
With the 10 mA forward current rating (I don't really know what that means, but oh well) is that resistor still suitable?
The forward current is the current flowing through the LED in the on mode (turned on).
At 10 mA the LED emits the maximum amount of light energy (brightness) for continuous operation
for X hours (Data sheet required).
Lowering the forward current will effect the light output (brightness) of the LED and can increase the live of the LED (Data sheet required).
Peak current is the max current the LED can handle for a short period of time (given in the data sheet).
Example use , pulsing light at high brightness.
1.2K Ohm as per Drustanos
post is a good value for your application.
Any standard wattage from 1/8-1/4 is OK.
Also - and this may sound like a dumb question, but I'm planning on soldering a resistor to each #5 connection (the (+) ) on each switch.
The LED's don't care how the resistor is connected to (+) or (-) on the switch.
Would it make sense to simply place one resistor in-line at the power out of the adaptor and then to a bus and from there wire the switches?
Will only work if you turn on one switch at a time without changing the brigthness.
Turning more than one on will affect the LED brigthness.