You can probably do a lot of that now if you code. It's just not something we support and you will probably have a lot of performance issues with it. I'm not sure why you would have been waiting for Gaia 2 specifically for run-time capabilities as I don't think that is ever something that has been mentioned as a feature for Gaia 2 unless I totally missed it somewhere. Regardless, at this point speculating on any Gaia 2 features is premature due to the Unity terrain changes. One of Gaia 2's main features previously was multi-tile. However, now that Unity is building multi-tile into the terrain system we need to wait and see what they add as we may no longer need to build multi-tile as a feature and can then focus on other features to improve other aspects where the Unity terrain system is lacking. With that in mind we really can't say what Gaia 2 will or will not have until we have a better idea of what Unity is doing. Anything we say now would just be broad speculation as a lot of the work that had been done on Gaia 2 previously may have to be redone from scratch or just simply scrapped because it is no longer relevant.