Hi,
1. The IRQ and FIQ are interrupt signals part of the ARM9 core (specified by ARM Ltd, not TI), and are usually not mapped to "pins" on the device (check section 5.7.1 of the OMAPL138 datasheet). However, from the simulator standpoint nothing stops IRQ and FIQ to be used as such.
2. This would probably be better answered by the experts on the device forum. In this case you will have to create the code that services the interrupts (or try to find one at the internet), but unfortunately I am not very knowledgeable about this.
Hope this helps,
Rafael