Disklavier

I'm new to the Disklavier world (just bought a Mark IV) so hopefully 
this question is just a lack of 'poking around' ... but it seems to 
me like there is a real lack of aftermarket 'stuff' as well as 
accessories for the Disklavier.  For example, some items I'd love to 
see:

- an extended battery for the remote (sorry, 10 minutes battery life
  just doesn't cut it, I want it to run for 3 hours!)

- a 3rd party tablet solution (surely someone could make this for a
  modest price of say $1000 rather than $4,500 for the OEM product)

- hacks for the remote interface.  I know it could be done, doesn't
  seem like anyone has done it though (maybe the market is just
  too small)?  For example, it would be great to have nested folders 
  on the small remote, rather than just a huge list of folders.
  I'd pay $50 for that 'utility' ... 

- a software utility to simply add lyrics to any existing disc/midi

- software to 'open up' the system for networking, it's Wi-Fi, I
  should be able to control it, edit contents, etc. all from my
  laptop.

anyone come across any of these types of things? 

Regards,
Jason