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The official presets use peak frame rate, meaning a maximum limit. You can use one of the 1080p30 presets with 25 fps sources and it will not change the frame rate. Likewise for 1080p60 and 50 fps sources.
HandBrake has PAL SD presets in part because of the resolution difference compared to NTSC SD. While the 480p30 presets won't alter 25 fps sources' frame rates, it would be disadvantageous to reduce the vertical height from 576 to 480 pixels.
Hopefully this helps explain things a bit. Cheers.
That will help, but it is just a little confusing knowing that a HD25 Hz project need the HD30Hz preset AND that it won't try to standards convert the video