There has already been much discussion on this but that is as far as it has got. To satisfy most users, I would like to see a tick box available, to choose whether the existing slide duration is kept, or whether it is allowed to change, when a slide style is applied. Clearly, for some slide styles it would not make any sense to keep the existing duration, but for others it is vital to do so. For example, currently if you have some video slides and you wish to apply some simple pre-defi