I think add-on will fit your needs, have a look at this link may hep you: http://dmytroduk.com/techblog/developing-simple-add-on-for-episerver-7-preview
You can configure a module. Have a look at: http://sdkbeta.episerver.com/SDK-html-Container/?path=/SdkDocuments/EPiServerFramework/7/Knowledge%20Base/Developer%20Guide/Configuration/ConfigurationModuleConfig.htm&vppRoot=/SdkDocuments//EPiServerFramework/7/Knowledge%20Base/Developer%20Guide/
I have created an editor for a custom property (just like StringList in Alloy Template), and I want to place the property, editordescriptor and dojo widget in a separate project referenced by my EPiServer project.
Can this be done? Any pointers?