To can add some "Marshalls" on demo hosts one day to forbide shortcuts at chicans ?...and some areas ?

nope, you cant load layouts on demo servers

oops i dont finish my sentence sorry.
....in short future.

My personal opinion is, that the demo already provides helluva lot of features as a demo, buying S2 for serious racing (no shortcuts nor wreckers) shouldn't be too much asked.

What does the marshal do? Is it if a car passes through the marshal's area they get a time penalty?

no they get directly pitlaned...i using this on S2 while prequalify sessions on some french leagues to have saved times tables uncheated.

Well, if you can load layouts, you can have some REAL fun on the carlot too...
And well... then Demo gets even MORE...

i'll not demo players can add any things or can load layouts...just can we (us S2 users only) open demo server with just Marshalls possibility to add.