Yes, there is. There is a Paint All function. But it is not in FlatCAM 8.5. You either use the development version which implies that you will install the Python toolchain or if you use Windows, you can also try one of the Nightly's that I post from time to time (just posted one). In the Nightly's there is also explicit support for Laser, replacing the Z commands with M3 - M6. You select this in the postprocessor combobox. Although latest version is only x64 so this might no work if you don't have a 64bit Windows OS.
Great! I'll download that one. I do use Windows, and a 64 bit version, so that sounds like the right approach. Many thanks.