In case the hiatus ends sometime soon, with a new version incoming:
You may be interested in the new
Text will be Text plugin, which allows you to set up a separate tileset for text to the rest of the tiles. As of version 2.01 (2014-06-04), it also allows you to add an arbitrary number of additional tilesets, tiles from which can be set to override specific items or building tiles. This functionally implements eternal suggestion #4 for full graphics support.
I'm going to include this in the Starter Pack, and it would be great to have a 'pure text' version of your tileset that can be dropped in. Most of the letters are already clear, but there's a few things like the quality symbols and any changed letters, numbers, and punctuation which are hopefully easy to include in a pure text tileset, and would make things a lot easier to read in cases where truetype doesn't work or has been disabled.
Any further stuff like overrides would be awesome, but given the rate of updates (including recently a demo of allowing different tile width for the menu) you might not want to invest too much time just yet - but don't let anyone stop you if it look fun! It's also probably a good way to deal with the whole walls-as-leaves thing that's going to come up in the new version, though that's still not so bad as the cursor/stairs/bins/'x' mixture.
Please don't feel any pressure - I just thought it worth sharing with the people who have done the work to make pretty graphics happen already