Is it possible to change the map group while the server is running?

I am in the process of configuring a Counterstrike: Global Offensive server and I was wondering if it is possible to change the active map group while the server is running, without having to restart the server process?

The map group is defined as part of launching the server process, and the server process in fact does not allow people to connect unless you have defined a map group (it gives players the loading screen where the map details and server mode information is usually displayed, but it never connects and eventually times out).

From what I can tell, map groups are defined in the gamemodes_server.txt file as follows;

"mapgroups"
{
    "mg_bomb"
    {
        "name"          "mg_bomb"
        "maps"
        {
            "de_dust"   ""
            "de_dust2"  ""
            "de_nuke"   ""
            "de_train"  ""
            "de_inferno"    ""
            "de_aztec"  ""
        }
    }

    "mg_hostages"
    {
        "name"          "mg_hostages"
        "maps"
        {
            "cs_italy"  ""
            "cs_office" ""
        }
    }
}

However, if I launch the game with +mapgroup mg_bomb, the call vote -> change map list only shows the maps from the map group 'mg_bomb' (ie: dust, dust 2, etc) but not the maps from mg_hostages. If I start the game with +mapgroup mg_hostages then I only see the maps from mg_hostages.

Is it possible to change the map group while the server is running?

Well, this is 5 years too late, but...

Any startup commands that start with a + are actually cvars that can also be changed in the server console.

i.e. mapgroup mg_hostages in the server console should change to the mg_hostages map group for the end of map vote.