As for IR loading - there's been a lot of requests for it, and there's no reason why the speaker dynamics algorithm can't be profiled to match external IRs actually. This and a lot of other "low hanging fruit" types of feature requests are all on the consideration list still for future releases, but they took much lower priority than the Speaker Dynamics feature. Recabinet 4 is still in the works, but I wanted to make sure that everyone gets a lot of mileage and value for their money out of version 3 first. How many of these kinds of features make their way into v3 or v4 instead is up in the air, but obviously the UI of the plugin has to change significantly before a bunch of "utility" type features can be added.