Increasing the maximum length for vibrato

Audacity 2.0.3/MacOS 10.13.3

Can I edit Steve Daulton’s Vibrato plugin so that the maximum selection length is more than 99,999 samples? Alternatively, is there a good plugin that does the same thing with no length limit?

There’s a plug-in here that does Tremolo or Vibrato. The length is not limited, but note that the sound quality will gradually deteriorate on long selections, and starts to become noticeable after about 30 seconds.