It’s doable, but non-trivial.
Currently the plug-in relies on using version 1 of JQuery Cycle and there’s no way I can see of making JQuery Cycle use a carousel effect.
There is a new version 2 of JQuery Cycle which can do this so the trick would be to rewrite the javascript to use it – as well as the code sending variables through to the javascript. The new plug-in supports this directly – rather than using intermediate code as I currently do – so in principle, the replacement Javascript could be fairly minimal.
The thing that slightly holds me back is that lots of other plug-ins use the old version of JQuery Cycle and replacing it with a different, non-compatible version could break all of them! You certainly can’t just drop it in as a replacement. It may just be a question of renaming the function in the JQuery Cycle 2 code to something like cycle2(!) – but I haven’t taught myself enough about jQuery plugins to know if it could be that simple. I think there may also currently be fewer choices of transition than the old script, so I’d be concerned not to break earlier installations if people upgraded.
I guess one way round this might be to make it a setting on the options page, so that people could continue using the old version if they preferred – while some of us went off and worked out how to make version 2 work properly!
So all in all, not impossible, but not something that I can get to particularly soon.
However, if someone else were to do it, I’d be very interested to find a way to build it in to the next version! ??