I would certainly like a toolset in the vein of NWN and NWN2, as well as disclosure of the data formats, in order to create additional content. Many of the games with longest-lived popularity are those with strong after-market tools. In fact, quite a lot of the work that went into Storm of Zehir was allegedly aimed at improving the capabilities of the NWN2 toolset.
I'm sure the determinant for Larian will be balancing financial cost/benefits of doing this compared with other alternatives.
