If you want, you can tweak the springs in the Electric ICE buttons. Extending their length by 1/8 to 1/4" (or more if you prefer) will give them a firmer feel and the spring will tend to resonate less. One of the reasons these, or any button deigned for microswitches has more noise than the arcade leaf originals is that these type of buttons have hollow chambers and bottom out on an internal stop to prevent someone from knocking the switch off the other side. It doesn't matter what you do, or which buttons of this style you use, are always going to get that sharp 'click' when the two parts meet with any velocity.
If you are getting "squeaking", a shot of spray silicone on the plunger legs or inside the body will likely be a permanent solution. Standard pushbuttons (the cheap ones) are made from nylon, which has certain self-lubricating properties. For that, they are also softer and can be cosmetically damaged by someone with only a fingernail and some determination. The EI buttons, as well as the HAPP/IL translucents, are made from polycarbonate. These tend not to have this property to the same degree, but are MUCH more durable. PC is softer than something like Acrylic, but not as soft as Nylon. While the EI buttons have a slightly higher pitch click than the HAPP/IL translucents, they are virtually identical for noise levels and self-lubricity.
I have only seen an EI button plunger "stick" for one reason, and that is the lighting board being out of place in the bottom. If it's not aligned correctly when installed, the leg of the plunger can catch on the PCB. If they are sticking for any other reason, then the hole in the panel is probably way too tight and compressing the body of the button. That's something that is also common to these type of buttons, so a little bit of extra clearance in button holes is usually a good thing.
As for lighting the white nylon buttons, the result was terrible IMHO. EI buttons are expensive parts to have produced, compared to the standard nylon parts, so if it could be done reasonably well this way we would be offering it as an option.

RandyT