Why not build one for yourself? It's not that hard to make. I did it a couple times and I was successful. Though I use Acekard 2.1 now and will update my R4 YSMenu if I want to.
PM me for more details about R4Menu.SYS and some files you want for your R4 if you are done with your own YS Menu.
Regards,
Chris
PS: Are you using a Genuine R4?