Offizieller Kommentar
Not at all!
You can, for starters, enable the ability to mix 1/2 or 2x BPM tracks:

But a better option is to select a more appropriate range to help rekordbox detect the beat more accurately; this will also ensure that songs of similar BPM are in the same part of your sort, as opposed to opposite ends of the BPM spectrum:

Selecting a lower range for lower-tempo track analysis will result with BPM detection that more accurately reflects the true tempo.