The days of aviation from the 60's 70's and AIRPLANE are behind us now.
9/11 help mold the accessibility for visitors to the cockpit.
Company Operations Manuals, along with Regulations have also be amended to reflect accessibility for visitors to the cockpit during flight. Manuals and Air Regulations have also been amended over the years to specifically outline who may occupy a flight crewmembers seat during flight too. The Regulations and Company Manuals include clear and concise language as to the consequences that may be faced should a crewmember go rogue.
Isn't it easier to follow the regulations and company procedures rather than risk being fired, or even worse losing an airman certificate?
That said, if one feels that change is in order, than perhaps one should start the ball rolling with their supervisor, the C/P, and follow the chain of command.
Until such time that happens, then no tea or sympathy those who choose to cross the line, or violate company procedures, which is tantamount to insubordination
.