I have used my 18SZ for about a month now, and I love it. I have one (small) complaint though- I wish it had more two-position switches and fewer three-position switches.

is it possible to change a couple of switches out?

These are what you need:

HSP79113 TFT1200921 TA86 PCB ASSY 3TF10 US$11.20 (short toggle)
HSP79115 TFT1200922 TA86 PCB ASSY 3TFL1 US$15.32 (long toggle)

These parts can be ordered through any hobby retailer who sells Futaba systems and accessories.

Thank you!