For the IC controls, you may need to rebind the key to activate IC. The default is \, but I never got that to work and instead rebinded it to SPACE, and it fixed my issue.
As for the speed, the 8000s only go 21mph, and the 8010s will go 24mph. This is realistic to the transmission changes John Deere made in 1999 to increase speed, but FS will always show 24mph top speed on the speedometer no matter what model you have.