I do toe-heel double clutch downshifts always. They are pretty easy on the Renault trannies. On my Mercedes C230 tranny, they are hit or miss so I think there is some dependency on the design of the tranny. This is easier on the synchro and because of that, the downshift is a bit quicker. I want to amplify Peter's point that if you have shifting, you should first pay attention to your linkage. It is long and in many cases include joints that can be problematic.
Concerning the detent cam on the 352 - I have to admit that I have no direct experience with that tranny so I may have made a "rash" assumption. From pictures in the manual, the 352 and the 365 have the same R detent mechanism but the profile of that cam may be different. On the other hand, Peter's may have been altered. It might be an interesting to compare the two. The parts manual gives different part numbers for them so presumably they are different.
Reading Tim Engel's post, quoted by Dan, I have to say that I've never thought, or needed to think about it, in that much detail - except that downshifting into second requires slight leftward pressure as you put back on the lever. I would only say that in general, shifting should be done smoothly and gently. If you have to man handle it, there is something wrong. I found Tim's observation that the clutch pedal all the way to the floor. Thinking I might like a more sensitive clutch, I tried to adjust the clutch a little tighter and I couldn't get into a gear because it would not disengage. I didn't exhaustively experiment with it so maybe I could have gotten a good lighter adjustment but I wasn't really unhappy with the way it was before so I just set it back. Since Tim's and my experiences are the same in that ares, maybe there is something about the clutch that requires a full pedal travel...
