[justaaron]

I agree. I've seen System-Verilog used for simulating such propagation delays, but it's not exactly a language-abstractable concept yet (precisely as it involves the actual hardware gate implementation) in that such black-box simulations estimate average propagation delay as a fixed function dependent upon results obtained from testing specific functionality blocks in specific devices specific gate-counts away from I/O pins, etc. It would be highly desirable to have HDL level modeling of this stuff in the abstract sense, although I confess to not knowing how that could possibly work, given the above.