[Jiaz]

So you just want all _ replaced with ' -' or just ; ?
You can create auto rename rules with Settings-Packagizer.
Please provide some example links, then we can provide better help with packagizer rules.
The eventscripter is an extension where you can code scripts (in javascript) that react on events (eg new link added). In case you want to go with that solution, you can ask mgpai (in english) for help. He is very talented with it!