To compare buildfiles or work on one directly, involves a bit of faff with unzip / find buildfile / re-zip, housekeeping the resulting files etc.
How about one or maybe two new items in the edit Tools menu…
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Export Buildfile - prompts for a target directory on the local filesystem and saves a copy of the module’s Buildfile.xml there.
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Import Buildfile - prompts for a source Buildfile.xml and copies it into the module (with a warning). Presumably the module will need to be closed and restarted as part of this operation.