As BorIDE progresses...

[LCD]

Ideas: Would it be awful for files to be .bas, which seems to be the file standard Boriel goes for?

Later, if I make file associations, I think, it is good idea to assign BAS with Wordpad. But I want to support BAS and my extension both, ZXBC does not care about extension.

Options: It's standard for program options to be on the tools/options menu tab?

For some IDE, Program (not IDE) options are in the sidebar, because they are much faster to access than using Menu and a own Window (It was there first, but I replaced it later with the sidebar menu. You probably noticed that each opened Program has its own options, and they are updatet as the program is switched, so you can watch on the fly if the settings are correct for your needs. I think that is so much better than using Menu with own Window.
Working with this system for around two weeks now and I don't want to miss it. But I can add additionaly program options in the Menu too.

I love the +/- options, which seems to be working on multi-line dim statements. One issue - I tried collapsing one (the last one in the dim section) and the whole program disappeared. I thought it would be just the dim statement.

Yes, the code folding... I defined "{" to open and "}" to close the fold. Maybe you forgot to close the fold with "}"? Even if it display a close fold margin icon at the last line, it awaits a close. Will check this later.