[gambatte]

If you checked programs in the kitchen, they are cooked in your ROM (=Read Only Memory). So no you can't remove them, you have to cook another ROM and reflash. You don't have to erase anything, the ROM will update automatically. You can make OEMs but why not just keep your program cabs on miniSD for emergency. You should always have a backup of your contacts (PIM backup) on your mini.

Oh and another thing, if your ROM is working to your satisfaction, the extraneous programs aren't really hurting anything, e.g. you can't use the space for anything but the ROM and can't use it for program space. If you want different kitchen supplied programs, then yes, reflash.