Remember how scouts began turning invisible in Jeeps when new sitting animations were put in (which was fixed before release)? Well, this one is kind of related to that. Apparently all that sitting counts towards the cloak timer, so that hopping out while holding the crouch key will insta-hide you. I highly doubt that this is the intended functionality, as it allows Scouts to completely bypass the hide timer when driving. I have not tested it with any other vehicles yet so cannot assume that this applies to anything other than the Jeeps.
Lawl... When I mentioned this a looong while ago; people screamed "Feature" now looks like the "Feature" has turned into sploit :p
Also, when you apply your squad hide as a scout in a jeep it doesn't work and when you hop out of the jeep you won't get hidden. Same happens when you apply scout's squad hide outside the jeep and then jump in and get out. Congratulations you have successfully spent 5 squad points for nothing.