There is nothing you can configure.
I don't know exactly what you are up to (testing etc...), but with some work you could merge some of changes from subversion.

You can also try to call:
SwarmingManager.getInstance().notifyDownloadListCh ange();
in DownloadEngine.startDownload() - Line 690


BTW: If you are patching, fixing, merging or changing any 2.8.10 code, some people here might be interested in getting this improvements, since 2.8.10 is the last version with Java 1.4 support. So let me know if you have anything that could be used for a 2.8.12

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