Is it possible to mount more than 4 slots/images on a player?

Right now, there is a limitation on the number of slots where you can mount images to a player in T3DB1.1 (max 4). Browsing through the source in shapebase.h you find

MaxMountedImages = 4,            ///< Should be a power of 2

Therefore it would be logical to change this into 8, 16 or so on, but right above this line there is a remark:

// The thread and image limits should not be changed without
      // also changing the ShapeBaseMasks enum values declared
      // further down.

and below it a line:

NumImageBits = 3,

Looking at the ShapeBaseMasks I find the following:

enum ShapeBaseMasks {
      NameMask        = Parent::NextFreeMask,
      DamageMask      = Parent::NextFreeMask << 1,
      NoWarpMask      = Parent::NextFreeMask << 2,
      MountedMask     = Parent::NextFreeMask << 3,
      CloakMask       = Parent::NextFreeMask << 4,
      ShieldMask      = Parent::NextFreeMask << 5,
      InvincibleMask  = Parent::NextFreeMask << 6,
      SkinMask        = Parent::NextFreeMask << 7,
      MeshHiddenMask  = Parent::NextFreeMask << 8,
	  SoundMaskN      = Parent::NextFreeMask << 9,       ///< Extends + MaxSoundThreads bits
// SphyxGames -> Melee
	  ServerIdMask    = Parent::NextFreeMask << 10,
// SphyxGames <- Melee
      ThreadMaskN     = ServerIdMask  << MaxSoundThreads,  ///< Extends + MaxScriptThreads bits
      ImageMaskN      = ThreadMaskN << MaxScriptThreads, ///< Extends + MaxMountedImage bits
      NextFreeMask    = ImageMaskN  << MaxMountedImages
   };

   enum BaseMaskConstants {
      SoundMask      = (SoundMaskN << MaxSoundThreads) - SoundMaskN,
      ThreadMask     = (ThreadMaskN << MaxScriptThreads) - ThreadMaskN,
      ImageMask      = (ImageMaskN << MaxMountedImages) - ImageMaskN
   };

So looking at the ShapeBaseMasks I should be able to change the MaxMountedImages to 8, at least this was wat I thought.

I rebuild the engine and ran it (debug-version) but I get an assert-failure "Invalid net mask bits set." in NetObject::SetMaskBits(..).

I've tried again by changing the NumImageBits to 4, but then I get the same result.

Now I'm pulling my hair out, because I definitly need more than 4 slots to mount.

I know I am missing something, so help is appreciated.
Thanks.