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As per the comments by @Pedro it is time to provide an updated answer to this question. The v4.2 release notes under Chart indicate these trend line enhancements:

  • Support more than one trend line per series (Tomaž Vajngerl)
  • Force intercept for trend lines fdo#40314 (Tomaž Vajngerl)
  • Extrapolation of trend lines fdo#40316 (Tomaž Vajngerl)
  • Polynomial trend lines fdo#35712 (Tomaž Vajngerl)
  • Moving average trend lines fdo#40315 (Tomaž Vajngerl)

Thus, with respect to this question, there is now a polynomial curve fit function. These enhancements cover all the issues (shortcomings) listed by the CorePolyGUI extension, and a few others as well. The CorePolyGUI extension may now therefore be redundant.