From what I've read, the lts.conf file is ignored. But you do have within cmdline.txt the ability to set the LTSP server to connect too. Would it be possible for me to modify your code to use an rdestkop instruction instead of a server instruction so that the Berry Terminal startup would connect to my Windows Virtual Machine instead of connecting to an LTSP server? Sorry, I have no experience with using the buildroot environment, but I'm willing to learn and try.
Thanks for any advice you are able to give me.