(1) I intend on taking a short break from Yikari. I do not play ToB myself, so I do not consider a skeletal ToB addition very important. However, I will include the basics (Fate Spirit, improved level Yikari and Epilogues) and no more in v1.2, if you want. V1.2 is intended to make him more like Bioware NPCs. He will interject and comment on the PC's Slayer change, story etc. like all the others.
(2) I will download Silver Star and have a look. Until he has a full soundset, it is a possibility. Currently most of his soundset consists of strings, and he doesn't have every slot filled.
EDIT: Silver Star does this by being Exportable. I am not going to make Yikari exportable. If anyone wishes to give him a soundset, they must open up the .cre files (sdnpc12 and sdnpc18) and change the class flags to 0x00000800.