Forest data haven't been processed yet, but they are in short term plan. There should not be any problem with getting them in, except that I need to make the formats a bit more compact as there are already too many files checked for updates at the program start, slowing it down.
The only potential issue I can see is how the existing vegetation index will play together with the forest data. Vegetation index tells the overall ratio between vegetation and bare ground, which also includes tree cover. It's not yet entirely clear how to guess the amount of vegetation under tree canopy.