I don't know but is it not possible the remaing grace instead of on 30 days putting them on 180 days?
Nope, can't be changed, 30 days is the limit M$ sets for unactivated installations & 180 days is for KMS activated installations. Anyway it doesn't really matter since IORRT rearms every time you restart your computer
No issues, you can safely update MSO 2010 any time & in the words of timesurfer "Just install and forget about it "