Hi. We don't actually handle seeking on the Roku platform as the built in player is in control of that.
However, you should be able to seek up unitl the live point so please provide details as to exactly what you're doing and the problem that is occurring.
How to Report a Problem
This isn't a particularly complicated problem to reproduce, so let me know if there's something missing from my descriptions. I'll try to be as specific as I can be.
Client: Roku Beta 3.1.186 / Roku Stick
12:20am EDT: Begin recording Colbert
12:32am: Go to my Recordings library and choose the episode I'm recording, which starts playing immediately
within a couple seconds, hit the right arrow, I can only seek within 8s of buffer. It's the standard purple roku seek dialog with no thumbnails.
about 15 seconds later, hit the right arrow, I can only seek about a minute. Same dialog.
about 30 seconds later, hit the left arrow, I can only seek about 2 minutes. Same dialog.
~12:34am: Upload log from Emby Beta
There are a few other playback attempts in the logs before 12:32, but I forgot to upload the log from the emby roku client until that last one. I also tried an untranscoded, but fully recorded episode from my library and I was able to seek through the whole file in that case.