Does anybody know how to apply a customized user settings to other existing or new users?. Something like a customized preferences settings for system wide so that everybody posses those settings and below will explain in clear what I actually ment.

On every machine I will install the following:

Eclipse
Mysql Query Browser and Admin
Mysql Workbench
Oracle VirtualBox
Thunderbird
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If I install them by apt, this will automatically create shortcuts in Applications but when I build them from source or extract the tar ball, I will have to add New Item at it's relevant place going to System-->Preferences-->Main Menu to make them available as a shortcuts and this settings are applied only for the account I login and perform them. How could I make this preferences settings for complete system wide which applies for all users? or if there is a way to apply a customized user settings to other users will also be ok. Any hint please?

Thank you!