The only way to skip through a recorded radio program is in fullscreen TV (which in itself is strange, but a better solution will have to wait.

When you try to do this, the skip steps work, but the skip step OSD (zapOSD?) does not appear, so you can't tell how far you are skipping.

http://forum.team-mediaportal.com/mediaportal-releases-315/skip-steps-recorded-radio-problems-79807/

Confirmed by markius.