I can't delete any presets in Rig Manager. Wanted to try out a load of cabs, but there seems to be no way to delete the ones I don't like. Same with other presets I guess. How do you do it? Is it possible at all. Or do we have to delete all these presets by hand on the Kemper itself? 
Can't delete presets in RM
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Yes you can. Just right click on the preset(s)and choose delete rig. It doesn't matter if it was a preset imported in RM or on the kemper itself.
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You can right-click and draw a box over multiple rigs to delete many at once. The same way you do it in Windows file explorer.