Thanks for your reply Denzil Chia.
But it IS possible! I dug around the theme files for a while, and in the theme folder under library/media/js/bootstrap/js in the file bootstrap.js on line 435, if you change “slide” to “fade”, you will get a fade effect. However, I don′t have java script skills, so the effect was a fade alright, but without a nice rollover transition into the next picture. It was more like a flip to the next picture – but the slide-in effect from one side was gone…
If anybody could point me some more to get the proper cross-fade transition, that would be great.
P.S.: before you mention it, I know that when the theme automatically updates my changes will be lost, but I always have a backup of what I′ve done on my computer. ??