I think that support is not here. tikiwiki.org is a collaborative website for developpers. As it's an open community anyone can participate. But you won't find professional support here. Support is what make skilled people live with free software. They sell support. Check FindTikiExpert ...
Anyway, one can find a friendly contact with skilled people anywhere, and find a way to get a free help. But it's a social thing you have to deal interactively with individuals, either here on forums or on irc.
well, that's how I feel things, but some other opinions would be welcome.