Deleting the log file during the build itself REALLY doesn't make any sense...because then you sort of need to log the fact that you've just deleted the log...
However, you could get around your problem by creating another .bld that simply calls your main .bld. Then edit and save your main build in a seperate VisBuild instance. Since this isn't terribly wonderful, you may only want to do that during the debugging phase.
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