"Lets take free speech. The Court has consistently ruled that the government may not regulate as to content (obscenity being a theoretical though not practical exception), yet it has also held that speech may be regulated as to time, place and manner. This means no loudspeaker trucks, at a reasonable hour and not on someone's private property etc.."
Those are not a limitation on free speech, they are about trespassing and disturbing the peace which has absolutely NOTHING to do with content. In fact the 1st Amendment has been used (erroneously as there is NO such thing as "freedom of EXPRESSION) to defend everything from flag burning to child porn (granted that has had mixed results, but wins in SOME instances)
" The idea here being that while we may speak and assemble and say what we will, we can't do it on your font lawn at 2:00 in morning."
You most certainly CAN . As long as I give you permission to be there and the Neighbors don't complain about the volume.
"A road test to drive your car, or carry (not own) a gun can be, so long as it is applied fairly across the board. "
Driving a car is not a Constitutionally guaranteed civil liberty , keeping and BEARING arms is.
Another problem with your examples refers back to MB's podcast #99, PRECEDENT, Ca. allows CCW with a permit, but in Alameda County you have to pay $3000 to get the permit, therefore I was deprived of my State verified civil liberty on economic grounds. Your suggestion would simply create another loop hole for abuse, just like every other precedent in legal history. Remember, the kiss of death for theories," It SEEMED like a good idea at the time".
Amendment IX: Existence of other rights for the people.
The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.
Amendment XIV: Privileges or immunities, due process, elections and debt.
Section 1.
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.