I've read somewhere to disable the option 'show OPROM' (something like this) under JMicron controller in bios to get rid of dual boot problem. But I have no idea if it works or not, im not having that problem.
Edit: (found it)...
I found that for the sleep mode problem (not sure if its your case but..):
http://www.overclock.net/intel-motherboards/854493-official-asus-sabertooth-motherboards-club-tuf-56.html#post13080641
Hope it helps.
I had the same fear before purchasing it. But those temps I showed were both at idle, and while playing, temps on pcie, usb3, vccio and motherboard jumped more than what I like (even if they were safe: 60-65 very often), so I wasn't feeling comfortable with that. Was getting messages from ai...
I received today my scythe mini silent kaze (using a CM V8 as cpu cooler).
Here you can compare my temps with and without the little fan:
Thats with a little oc @ 4,4Ghz (2600k).