why do you want that?
as i explained, jdownloader does most of that stuff in background without any need to restart (at the moment we work a lot on the core ,so yes, restart are needed) but in future with plugin only updates, you dont have to restart as jdownloader can install them on the fly. also jdownloader does autorestart whenever it is possible (no downloads for example)...
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JD-Dev & Server-Admin
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