If it's at the end of a conference, there's little point asking people if they'd like to know less about what they've just been told. Know more about, yes. But that's "communicators" for you!

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Note added at 3 hrs (2011-10-07 15:06:23 GMT)
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Apart from that, the use of language means the context, or meaning of the questions, is not clear.

moins développé is a comparative, so we have a benchmark below which we wish to drop, presumably what has been presented at the conference.

très développé is an absolute. Since no benchmark is involved, this could be prior to the conference, i.e. concerning a list of topics the organizers are prepared to address in greater or lesser /great or little detail, depending on the opinions voiced.

Which is it?

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Note added at 3 hrs (2011-10-07 15:09:58 GMT)
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Morever, souhaitez in the present suggests this is a pre-conference desideratum. Were it a post-conference wishlist concerning the topics addressed by potential future conferences, I should expect the conditional souhaiteriez to be used.

We need to know!