When exploring a project, we could be able to add grains.

[pascal-ballet]

the toolbar should be visible even if we are not the owner of the simulation.

[jeancharles-roger]

You are able to add a grain in a project if you clone it and now the clone button is always accessible.
It would be possible to automatically clone a model when modifying one that it's not ours.

It seems interesting but I'm not sure if it will confusing or not.

[pascal-ballet]

Ok for the clone, but you sometimes just want to play a little bit with the simulation.
For example, Nico want to add a new sun in the "Un jour en Bretagne" to make "Un jour sur Tatooine" :-)

[jeancharles-roger]

In this case, he just have to clone the simulation to add a sun and changes the probabilities of the behaviours (they still need to be saved in the simulation see #78)