Unfortunately no. The game only accepts this. The only thing I’ve been able to do is to copy-paste the useful engine sound segment several times so the pause would become more rare. But it is not always viable as the game limits the size of acceptable sound packages. With longer samples the modders are already close to the limit. However I don’t think Audacity inserts silence into each of the sound files, so there might more factors.
Here’s another topic I started about the same project of mine:
I don’t know what block sizes Audacity uses, but at 44100 Hz, if you cut on a multiple of 4084 samples, you will export a complete file. See the attached (which still needs attention to sound “seamless”).
You can right-click over the Selection Toolbar digits to change the selection format to audio samples.