Ooh, you're a tricky one. I like that. I'll mess around with it to see if I can get 48000 to play. But the 24-bit would require adding a line specifically for 24-bit and would most likely require coding to AAC or something similar since only 16-bit WAV is accepted...I think.
If you notice the line for LPCM, the mime type is l16. This means 16-bit LPCM. The mime type for 24-bit LPCM would be l24 which is not recognized by the PS3 as far as I've seen.
Now, as with the resampling to 44.1 or 48 kHz, are you certain that your original is one of those? If so, then it shouldn't resample at all and should actually just play it normally. However, if it is something along the lines of 96000 or so, then you will need the resampling button checked. I have a few files I can test this with. Feel free to thank Pink Floyd for that.