[ESS] Is this useful for discriminating Sweave vs knitr docs?

[Stephen Eglen]

Rstudio use a simple comment like:

% !Rnw weave = knitr

to ensure that Rstudio knows the current .Rnw file should be processed
with knitr (rather than Sweave).  Would that be useful for ESS to adopt?

https://support.rstudio.com/hc/en-us/articles/200532247

S