F800gs,can the front discs made solid like the 1200gs front discs?

Is irritanting where applying the brakes? Or just because are loose when you touch them? If is the second one is normal for disks to move a little. If braking is not affected don't worry. Just check the disks with some gloves after a ride when the brakes are hot. You will see that the disks are tighter than cold.

Did you bench bleed the MC before installing it? If not, that's the problem. MUST be bench bled or you'll always have air. If brakes lights are on, the brake switch is out of adjustment OR (since you replaced the MC), the push rod is out of adjustment

red light is stands for hardware boot and the green one is stands for system boot and disc boot. when red light remains solid it means your system is in 0% cpu usage and nothing doing, stop working

yes new fluid and proper bleeding will make the brake feel normal, the sponge feeling is air in the brake system compressing

here are some resources from F800 depot:

http://f800depot.com/boxer-series-disc-lock-p-132.html?zenid=4afe38db9b2a81bb970f93f48d34a2be

http://www.webbikeworld.com/motorcycles/bmw-f-800-gs/bmw-f800gs-accessories.htm

http://www.twistedthrottle.com/trade/productlist/723/