Welcome to the new user community. We have just recently launched and are working on building the user base. Hopefully somebody will be able to provide you some advice in regards to your question. If not, the product knowledgebases could be another source.
You can change the default document name (in Centreware IS, go to the properties tab > services > email settings > defaults > filing options), however this will just change your default document name from "Scan 001" to "YOURNAME 001". You can't assign a specific attachment name when performing a scan to email job.