Somehow doing FMC has given me the power of ultimate look-ahead. During my (keyhole) F2L I got to this state: L' U F' U L F U2 L2 F' U' L F L2. I didn't see the pair (I don't look for that kind of thing so I did R U R' to insert the corner. Then I "just saw" that R U R' U' F' U' F U (pretty alg from 20 years ago) would give an OLL skip AND that the PLL would be T-perm.
That was my first controlled "speed-skip".