Nice work and thank u for sharing.
I don't know if you know how to add it but there are new additional menu items in multirom recovery with
TWRP_3.0.2-0_multirom_m8_20160418-02.img (well new since MM anyway ????)
The no-kexec work around option is missing in the materialized theme.
Lol, I just realized I failed to see if the other new stuff like MR klogs was also missing... I'll report back later though.
Again thank u for sharing, I've been hunting for a MR 3.0 theme since MM dropped ????