I did not see this question until just now.
In P8 this is controlled by “Project > Language Settings > Other Characters > Word break characters”.
If you have a project that uses /'s and ^'s as places where lines can break without a hyphen and ='s as places where lines can break with a hyphen you need to enter the following in this field:
=(00AD) /(200B) ^(200B)
If you do this, when you switch to Preview view you will no longer see = / ^ but instead see ZWSP (which are invisible but allow line breaks) and hyphens for = (if the line breaks at that point).
Since the default replacement is ZWSP this could also be entered as
=(00AD) / ^
We have some issues that need to be fixed
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If you enter characters in this field with the wrong format, on my machine at least, you do not get an error message, it just disables the OK button.
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The guide does not mention that you need parenthesis or how to specify multiple characters.
I will write a bug report for this.