If there is just one guy coding on RT, that does not mean that the plugin for Soft needs that long. The plugins for the different packages are built by a bigger team, so building the "bridge" from Soft to "RT" is an other thing than coding RT itself...
As far as I know, Vray for Soft has the same features and issues as Vray for other platform, despite the RT implementation, as already mentioned. Flickering could be an issue of course if you use any GI approximation such as "light cache" or "irradiance map" and so on. There is much info around on the web concerning solutions to this issues. The cool thing is, because all the shaders and render settings are the same over the whole range of different implementations into different packages (fo 98% I guess) it´s easy to adapt tuts found on the web to the Vray4Soft plugin.
Thanks for your explanations