I would really like to see a small image of the sample waveform for the selected / playing sample in the file browser.
Why and how?
The skip forward / backward line could be replaced by an indicator of any type that sits on top of the waveform, showing the starting point of playback and current playback point.
The 'pool' view already has something similar, only it doesn't use the waveform to show you the playback point of the audio file. If implemented like this in the file browser, it would be a missed opportunity not to do it properly all the way.
An added bonus is that more often than not you can actually recognize if the sample you see is the one you're looking for by just seeing the waveform. This is especially handy with longer samples as you don't have to play them back anymore or skip around looking for that 'part' you want to hear.
If it turns out these waveform images slow file browsing and sample playback down too much, I wouldn't mind a right mouse-click menu option to 'analyse' the contents of the selected folder. This could then allow for some scanning time and prepare images of the waveforms, allowing for smooth browsing and playback after that.
The scanned information could either be stored somewhere so Studio One can refer to it on later sessions as well, but even if the scans would have to be made again and again, preparing a folder you wish to browse and waiting for 5-10 seconds is a small price to pay if you get waveform images in return.