Ok, then I will stick with OpenJDK.
Seems when playing with BD menus video playing behaves differently.
This fast-forward and fast-backward issue I already noticed. I'm talking with one guy who knows this area little better and he told me that according to Blu-ray specs, players should always support rate 2 (double speed). Higher speeds can also be supported, but isn't required. Not sure why this doesn't work in Kodi.
On "the other forum" user also reported that video was software decoded. When playing without menus they are decoded in hw. Not sure why.
Maybe The team could ask about this issues Kodi devs.
I think the software-decoding issue also explains the performance issue of BD menus, since software-decoding is using too much CPU resource, not enough left for java runtime...