Games-Howell Test (Tukey HSD with Welch's Correction for Unequal Variances) in F...
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This is probably the most frequent limitation of JMP at my organization. Unequal variances suggest to use Welch's ANOVA, but options are limited for multiple comparisons with unequal variances. Steel-Dwass doesn't work well with small sample sizes and it's not clear that it is robust to very unequal variances.
Games-Howell test is effectively a Welch's version of Tukey's HSD and works well with small sample sizes.