turn off text transforms

hi all,
if I enter the following into R.app

1/8 x 248.70

I get
Error: unexpected symbol in "1/8 x?

Because OS text entry is transforming 1/8 into ?.

Is there a way to turn that off selectively for R.app?

Brian is right, but I noticed myself that there is something wonky going on with the editor on Lion - it is translating characters where it should not (e.g. \dots) - and I know only of the global configuration to disable it. I'll have a look if there is some message that could be send to the text view on Lion once I'm back (next week) because its highly annoying ?

Cheers,
Simon