That stuff's all in the models.ini files so you could try editing them. The Typhoons are the lines where FILE=924.kn5
If you change the RND_POS_RANGE so something like 50000,50,0 that should randomise the start point by 50km, and therefore the timing of them passing over. The second number is the altitude, which is currently 200m. Adding a randomness of '50' to that will mean they should be as low as 150m.
Never actually bothered trying anything like that myself. Let us know how you get on.
If you change the RND_POS_RANGE so something like 50000,50,0 that should randomise the start point by 50km, and therefore the timing of them passing over. The second number is the altitude, which is currently 200m. Adding a randomness of '50' to that will mean they should be as low as 150m.
Never actually bothered trying anything like that myself. Let us know how you get on.