The encoder checker can handle other sample rates than 44.1 kHz.
What it can’t do, is to compare files/encodings that have difference sample rates (this won’t change).
The encoder checker in WL 8.5 is a great value and has good features and the rating system is very clever, but one thing that Sonnox Pro Codec does that i find valuable is to output the “difference”. It other words, when you are listening through a certain codec setting, you can listen to just what the codec is filtering from the audio to make it a compressed file.
It’s quite interesting. Maybe it’s something to consider adding in the future.