[Haskell-cafe] Tweaking the garbage collector for realtime usage

The GHC documentation lists a lot of tweaks that can be done to the garbage collector. However, Haskell spin-offs like Timber http://www.timber-lang.org/ implement their own incremental garbage collector that is better suitable for real-time usage. Did someone already fiddle with GHC's gc flags so it works better for real-time applications, like games and simulations?