Hm I thought seeking doesn't work either. If it does it's probably just a matter of hooking up the proper actions in the player to interprete the small/big skip forward/backward.
Always read the online manual(wiki), FAQ(wiki) and search the forum before posting.
Do not e-mail Team Kodi members directly asking for support. Read/follow the forum rules(wiki).
Please read the pages on troubleshooting(wiki) and bug reporting(wiki) before reporting issues.