[Ender]

In the base_teamplay.lua, where the base_flag is defined, it seems to have a check for the status of the flag pertaining (i.e., if it's 'home', picked up, or dropped):

-----------------------------------------------------------------------------
-- Flag
-- status: 0 = home, 1 = carried, 2 = dropped
-----------------------------------------------------------------------------
baseflag = info_ff_script:new({
	name = "base flag",
	team = 0,
	model = "models/flag/flag.mdl",
	tosssound = "Flag.Toss",
	modelskin = 1,
	dropnotouchtime = 2,
	capnotouchtime = 2,
	botgoaltype = Bot.kFlag,
	status = 0,
	hudicon = "",
	hudx = 5,
	hudy = 114,
	hudalign = 1,
	hudstatusiconalign = 2,
	hudstatusicon = "",
	hudstatusiconx = 0,
	hudstatusicony = 0,
	hudstatusiconw = 50,
	hudstatusiconh = 50,
	allowdrop = true,
	touchflags = {AllowFlags.kOnlyPlayers,AllowFlags.kBlue, AllowFlags.kRed, AllowFlags.kYellow, AllowFlags.kGreen}
})

I'm not sure if this is specifically what Crazycarl is referring to, but it seems like it. Now, how you'd access that and implement it is a little beyond me at the moment.