It is a very nice keyboard layout. I'm very happy I discovered it (even if it was by mistake!)
Another example I can think about: remap the Ro key to toggle between international layout while it's pressed, so you can switch between layouts with a key right next to the shift key.
For example, on a US/RU settting, press Ro while pressing the 6 keys to the right of Tab in a sequence and you would get ЙЦУКЕН, don't press Ro and do the same: you would get QWERTY. Mixing and matching in both upper and lowercase would be very easy.
With the extra keys, you can have 4 modifiers on each side of the space bar: Control, Win (Super), Alt and Cmd - total 8 modifiers, ideal for your thumbs!
This still leaves you with the Yen and the Ro key to map for other things!
Another example I can think about: remap the Ro key to toggle between international layout while it's pressed, so you can switch between layouts with a key right next to the shift key.
For example, on a US/RU settting, press Ro while pressing the 6 keys to the right of Tab in a sequence and you would get ЙЦУКЕН, don't press Ro and do the same: you would get QWERTY. Mixing and matching in both upper and lowercase would be very easy.