I think it's because i touch my limits in English (
sorry, i'm french XD) and the limits of my 3D vocabulary.
In fact you already answered my question
I undestwood that : It's impossible to enlarge the 0-1 space (or add texel density inside). So, the only way do add texel density is to organise the UVs in a better way inside this space (
and work better the mesh, and stack parts). Theire is no way to project more texel density.
