As multi axes support is one of the feature requests that pop up from time to time:

there is a new implementation in a special branch: http://sourceforge.net/p/qwt/code/HE...-6.1-multiaxes. Even if not 100% complete ( some layout code issues with long titles + QwtPlotRescaler is not yet working ) it should be much better than any of the patches for earlier versions of Qwt.

The Qwt examples work with this version, so the API changes should be more or less painless for most of the application code. So I'm considering to have it in Qwt 6.2, but I'm not decided yet.

Reporting bugs or commenting the API can be done on the Qwt mailing list ( or here ).

Uwe