[WimKl]

That's StepForward/Action(StepForward) or StepBack/Action(StepBack)

But those aren't player controls.

The Wiki says, that it's skipping 30s but that's wrong. We need to update that. It will refer to the skip steps you set at the settings under: Settings -> Player -> Videos -> Skip steps

So I added this in videoOSD.xml:

                    <control type="radiobutton" id="604">
                        <include content="OSDButton">
                            <param name="texture" value="osd/fullscreen/buttons/FW.png"/>
                        </include>
                        <onclick>PlayerControl(StepForward)</onclick>
                    </control>

and nothing happens when I press the button, maybe it's interfering with this a bit further down?
            <control type="group" id="6000">
                <top>60</top>
                <visible>Player.SeekEnabled</visible>
                <control type="button" id="87">
                    <include>HiddenObject</include>
                    <onup>200</onup>
                    <onunfocus condition="Player.Forwarding | Player.Rewinding">PlayerControl(Play)</onunfocus>
                    <ondown>200</ondown>
                    <onright>StepForward</onright>        <-----------THIS ONE HERE?
                    <onleft>StepBack</onleft>
                    <onclick condition="Player.Forwarding | Player.Rewinding">PlayerControl(Play)</onclick>
                </control>