As for the ABS issue, you can safely ride without ABS if you want. I did for many miles until I got mine fixed. To get it fixed you have 3 options;
1 take it to a BMW dealer and let them install a new one for a crapload of money
(BMW does not consider the module to be a serviceable part. They will charge you for a new one to the tune of $1600 and then charge to install it.)
2 disconnect the ABS module yourself and send it to Module Master who will fix the issue, give you a guarantee and ship it back fast, all for $285. When you get it back you will need to reinstall it and bleed the brakes but that's it.
3 attempt to fix it yourself if you are mechanically inclined (and want to) for free. Do a search and you will find the process.
The clutch issue (if that is in fact the sound) sounds like it could be normal IF there is no slipping anywhere. I wouldn't worry about it if pulls fine throughout the band with no other noise or felt bumps.
ANY trip to the BMW dealer is a costly trip to the dealer. It sounds like you have intentions of taking the bike to the dealer. Which is fine if that's what you want to do. Be forewarned it will be pricey
Many people here, myself included, do their own wrenching and save a lot of $$$. But saving the money is only part of it. After you do the work, you know exactly what's "in" the bike.
They do have their known issues but they are great bikes.