I'm guessing TeX will meet most layout needs. For example,
> I just discovered the \over command, which will generate
> fractions in TeX and LaTeX. \frac only works for LaTeX. I
> will make tex/latex an rc param if you want. Let me know.
frac was the only use case I thought important. If over can do it I
am fine leaving it as TeX. We can generalize later if need be.