Not in a PIC, no. But oh, for the days of the Motorola 68HC05/08/11 timer - you could do an arbitrary number of timings in about a dozen lines of code, plus maybe five lines per timer.
I did two interleaved timers on an 8008 in about 1974 or 5 or so. It's almost trivial - you have one main loop that's calibrated, and each pass decrement each counter and test, then either change the bit or do a NOP or as many as you need to not mess up the timing.
But the Motorola timer is a dream, once you figure out how to use it. :-)
Cheers! Rich