probably you know, that the "Mediaserver battery draining bug" still exists (Just google it...).
I´ve seen, there are already some ways to kill Mediaserver with scripts, flash, copy to...but no app, that does that.
So here it is, a free app for the comfortable user
What this app does:
# Kill Mediaserver whenever you want/need
1.) When default lockscreen unlocked
2.) Certain time interval/schedule
What you need:
# Root required
Download Mediaserver Killer from Playstore
# You just need to give Mediaserver Killer Superuser access (remember choice forever) and disable Superuser notification toast or statusbar.
# I may implement other options if needed