Probably not the help you're looking for, but my technique to at least alleviate the stress of this.
As far as I know, no. There is not a way to do it.
I write the script in Notepad++ and save it as a .VB file. Then just copy and paste into the first scene, compile and test it, then make any adjustments needed. Once it's good, copy and paste into each scene individually.
I then have the .VB file I can open up and edit later on. I still go through the time of C/P into each scene, but I only "work" in that one file outside of XPression.
#XPression