Hi Argiñe,
It is not possible to make these kinds of changes to the dialogs of blocks from standard Simulink libraries unless you break their library links - which I would not recommend.
Instead, create your own custom mask on top of any block. On that custom mask, you can include whatever tabs and parameters you would like. To create a mask on top of the Simscape block, right click on the block, select "Mask", and then select "Create mask".
If you have not worked with Simulink masks before, I would read through some of our documentation first. To start, take a look at this page on masking fundamentals. Then, you could create a mask by following the steps in this example.
