Dreambox 800hd se seems come out these days with a new remote: RC10, From the box, the remote does not seem to facilitate the timeshift option. In the "regular dreambox remote" this used to be the yellow button.
In the rc10 remote this timeshift function can be added with a keymap.xml, and then the button to press would be the play/stop button, which seem to replace the yellow button on the "old" remote.
Works very good, although some times if it does not work, we have to open another channel, and then back to original channel.
However, if we update the software, or re-install openpli, we have to replace the keymap.xml again. Maybe the devellopers can find a way to do this automaticly during update and/or installing openpli image.
This keymap.xml should be transferred to user/share/enigma2, and the dreambox unit should be restarted.