Well I didn't remove any "unrar" support from LE nor doesn't really make it any sense for me to compress a video file with rar. Maybe it's not obvious but this build is based on LE9.0 upstream code so if vanilla LE would support "rared video" files my fork would also support it.
Okay I compressed a h265 video file and saved about 4,5% space. So 2.55GB before and compressed 2.44GB IMHO not worth the hassle.
Again if ES freezes then provide a logfile.