I’ve just added a couple of new keyboard shortcuts that you might like! They were inspired by YouTube which has the same ones:
j: skip back 10s (mp3) or 8 words (TTS)l: skip forwards 10s (mp3) or 8 words (TTS)
These were added along with an experimental new mp3 upload feature which you might also be interested in: NEW mp3 audio upload with auto-transcription!