Hi. I use the Plex app on Android to remote control the playback on my Chromecast from a Windows Plex Media Server. Every time I hit the "10 seconds back" button on my phone the Chromecast takes around 4-5 seconds of buffering to start playing again, and in most cases if I was distracted it's usually around 30 seconds or 1 minute, not 10 secs, so if I want to go back 1 minute I have to pay undivided attention to the app for 25 seconds before I lay back an relax. It's so annoying I prefer to try to scroll back using the playhead and maybe go back 2 minutes by mistake (it's not a very precise method).
Can't you just put the standard 30 seconds back button, or maybe a setting to chose how much you want the button to rewind?