I think it would be MOST useful if users were able to select/change a custom 30-second range of the preview window.
I play short punk rock songs and the current setup doesn’t allow me to preview crucial sections of my songs. 
Digging the online mastering functions otherwise. Radio DJs have noted that my masters are better sounding than ever
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I sent some very similar feedback to them myself a couple of weeks back. Here’s hoping they feel the same way.
I totally agree, in my case, it always selects the part where nothing is going on. Very annoying that i have to spend a credit to hear whats actually going on in the master.
Yeah, that would be an oversight on their part. I get the impression that the service is still undergoing some improvements.
I just don’t know whether this would be one of the things they’d address. However, if they have enough people making the same request there would be a better chance it will get look at.