Editing properties of several objects at the same time

[Nodragem]

Hello,

I realised yesterday that we cannot change the properties of several objects at the same time when animating.
For instance, if I want to make all my images going transparent, I cannot select all of them and change the alpha property. Instead, I need to select the images one by one and change the alpha for each of them.

I would be nice to be able to edit the properties for a bunch of selected objects.