As BorIDE progresses...

[LCD]

does it save the source code to .bas on every compile?


also including local .bas files doesnt work,
you must be changing the 'current directory' within BorIDE

It uses BOR extension, because it generates additional configuration file which BAS files do not have, but you can rename BOR to BAS. And yes, it saves the file before compilation. There will be more files generated later: Binary manager chunks, binary manager configuration, and a file which define which additional files belong to a project (fonts, binaries, graphics,...).
There are multiple directorys used: Temporary directory for currently compiled project, Source directory for sources of a project, and output directory for the compiled project. Especialy with new project and importing BAS files you must define the source directory and output file. Once defined, this is always saved in configuration file of the source and make the multitab codind easy. You had to define the source directory for new projects anyway.
With "including" do you mean "Loading" or "#include Filename"?

You can use the .py included with the compiler to generate BASIC binaries. The compiler uses it generate the BASIC loader.

I know that, but I have good reasons to make a own BASIC loader: As there will be a binary manager (interrups, memory banks and such stuff) they must be exported to CODE files, and loaded. The Loader generated by ZXBC cannot load further code files nor can it switch memory banks.