I can not make reliable 95th percentile graphs because that depends on the average over which it needs to be calculated. I can draw a line ofcourse for the 95th percentile but these would ofcourse differ per graph as most graphs have different average timeunits.
The 2 hour graph is 1 minute averages, the 16 hour graph is 5 minutes, the weeks graph is 30 minutes. etc.
Regarding your other point, no can do.
You might be interested in the bandwidthd package.