OK. With 3247 you can do something like this on macOS:
builder=~/Library/Application\ Support/Corona/Native/Corona/mac/bin/CoronaBuilder.app/Contents/MacOS/CoronaBuilder ${builder} build --lua build.lua
On Windows will work in 3248 (minor bug in 3247 breaks a build)
cd "%CORONA\_PATH%" Native\Corona\win\bin\CoronaBuilder.exe build --lua Z:\Projects\b2-win-html.lua
with contents of build.lua:
local params = { platform='html5', appName='2 Player Html', appVersion='1.0', dstPath='/Users/vlad/Projects/myCoolApp', projectPath='/Users/vlad/CoronaBuiltApps', -- includeStandardResources=false, } return params
And make sure to run Native/Setup Corona Native.app
Cheers!