Cyno spoolup. Introduce timer, during which cyno is not visible system-wide and cannot be jumped to. Example: normal ships 30 seconds spoolup, 5 minutes cycle; capitals: 60-90 seconds spoolup, 5 minutes cycle; force recon: 5 seconds spoolup, 1-2 minutes cycle. If needed, civilian cynos (for jump freighters) can be separated to have shorter spoolup (as separate module or via script).