Hello Neoptolemus!
Look at
THIS link, here Mikko make annotations builder for recast, combine it with some HL related changes and trace line checks will allow to create jump connections and maybe more...
BTW:
As for AAS, Quake3 uses a modified (more informative) BSP format, by which the creation of AAS became possible.
We do not even have the opportunity to realize the normal TraceHull function with custom hull size or even TraceLine, that will hit clip nodes...
Sorry for bad English...