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is there the possibility of having the 767-300 in cold and dark panel ?

Open Windows Explorer and navigate to Prepar3D v5\Captain_Sim\767-II\panel\basic folder. Copy the COLD AND DARK.cfg, then paste it into Prepar3D v5\Captain_Sim\767-II\panel\custom. Rename the copied COLD AND DARK.cfg to DEFAULT.cfg. Then in the 767, open the CDU (SHIFT+6) > Menu button > Setup > Options > Next Page button > turn on LOAD DEFAULT PANEL STATE

Now each time you load the 767 into P3D, it should be in a Cold and Dark state.


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it would be nice to have the possibility to choose the quantity of fuel

The only way I can get this to work, is to change the fuel quantity in the default flight.


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as well as to be able to have the pause at the Top of descend

This is already there: CDU > Menu button > Setup > Options (it's the first one on the list)