A-HA!!!
The script for TPM does indeed have Sidious choking that guy, even adding a line about how 'only a Sith can reach this far...', as proof as to why they should be more afraid of HIM than the Jedi!
It appeared to get cut, though.
However, this seems such a specific question to ask that I can only assume that Yerssot read that part of the script on the Insider's CD and posted here about it...
Terribly sorry Ush, but in Belgium there is no Insiders guide, and I don't think there is one in Holland, maybe in England orso.
The reason I posted here was that I thought that Sidi was just paying the TF to do the job, I mean: he doesn't menace them for doing the job AND you know that 'the Emperor is not so forgiving as I am (=> I=Vader) and Vader almost choked a guy for laughing at the Force