I looked at it the last few weeks and it seems that there are (at least) 2 manufacturers who make R4 clones without RTS capabilties.Official wood has RTS with r4ids.cn or r4idsn.com. But non of the unofficial wood clones have RTS.
They can be identified by the following characteristics:
- "Smart Upgrade" written on the label
- Either has www.r4isdhc.hk or www.r4isdhc.com.cn on the label
- Deep Labyrinth icon in the DS menu
Those carts are pretty much like any Ace3DS cart and don't come with any special features.
Those can be seen here:
There are however also R4 clone carts that DO support the RTS feature.
Those can be identified by the following characteristics:
- "Real Time Save" written on the label
- Only www.r4isdhc.com on the label
- Bomberman icon in the DS menu
A video about those exists here, which also shows the RTS feature and that it indeed works:
I don't know if that RTS menu is exactly the same as from the real Wood kernel as I have never seen it before, but it looks good to me.
There is also a cart that was apperently never released but somehow made its way online.
It has some sort of frankenstein kernel which is kinda based on Wood but seems to have implemented its own RTS in-game menu.
This cart and its features can be seen here in a german review: