Hey Todd congrats on getting the v4 that sounds awesome!
About the screensaver you can drop a fred80.cfg next to the FRED-80 binary to override defaults. So create that file next to the fred80.m68k file.
Set ss_timeout (in seconds) to change it, or set it very high to effectively disable it.
# fred80.cfg ss_timeout = 30
Let me know if that works for you!
If you look at https://fred80.dev/examples.html there are a bunch of examples you can copy paste into fred80. Ive not tried copying and pasting from the website into fred80 on my v4 before though!