The Connect surface tool by Dimitri.

[Dimitri]

It is just the thing I asked for as it seems! Going to download the latest version and test it! : - )

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Played with it a little bit. In simple, smoothly curved surfaces works as expected. In non so regular surfaces it shows a little bit unexpected behavior. Sometimes it generates some connections on other, non selected, areas of the objects too. But both problems are not so important. It is not necessary to use it in densely wavy surfaces. As to the second case, the not needed edges can be selected (by loop selection) very easily and deleted. The important thing is that it produces perfectly straight lines-edges between two selected vertices on simple, smoothly shaped surfaces. It is a nice connect tool that in most cases makes things quite easy.

If I detect other problems in its working I will mention them here.

Thanks... : - )