You can get Ramp Up if you directly assign the LFO to Filter Cutoff rather than using the FM control - drag the cutoff knob's modulation handle the other way and you get negative modulation. It may also be handy to set the LFO to Bipolar mode for some circumstances.
But yeah, it could be handy to have a ramp up on there as well, so you can quickly switch between ramp up and ramp down while working with the effect.
Has got me thinking though that some sort of LFO presets management could be very useful. The control you get over the LFO shape is great, but to quickly select saw/sine/square probably takes longer than it should.