Yes, I use Sublime Text 3 for my DBpro coding. Really you can use any text editor you want. I've previously used Notepad++ for DBpro as well.
To compile from outside of the IDE, just pass the .dbpro file as an argument to the compiler (you can either manually create the .dbpro file, or use the default editor to create it initially). You can probably set this up as a build system within Sublime, or just make a .bat file:
"c:\my darkbasic professional online directory\compiler\dbpcompiler.exe" c:\pathToMyProject\main.dbpro
You need to have the IDE/default editor closed to call it from the command line like this or it will throw an error.
Be sure that you are passing the .dbpro 'project' file, which contains configuration data, not the .dba 'source' file which contains your code.
I've written a more robust build manager that I am using, and I'll post it up in a separate thread with details.
Here are the language and theme files (attached) that I use for DBpro in Sublime. As mentioned in another thread, the language file mostly provides syntax highlighting for control commands and does not define the majority of the language commands. these could be added, but I like the clean minimalist look.
A single player RPG featuring a branching, player driven storyline of meaningful choices and multiple endings alongside challenging active combat and intelligent AI.