Suggestion :
While we already have fields for Platform, OS, etc, I would like to suggest an additional field for "software component" where it is possible to define fixed values that can be shown in a drop-down list for selection.

For example, in a Mantis usage scenario where it is used to track bugs/issues within eg. an SAP project, a field such as "software component" would be just right to describe the SAP modules and sub-modules (FI,CO,MM,SD,PP, etc). There are sub-modules under FI such as General Ledger, Accounts Receivables, Accounts Payables, etc (eg. FI - Financial module).

Obviously, there is also Sub-project and Category that can be used to describe these SAP modules. One integrated SAP project would consists of multiple modules which cannot be meaningfully defined as sub-projects. Category is really more appropriately used to describe the type of bugs/issues. Of course, custom fields can be created too. Overall, I see that none of these approach will be neater than having a "software component" field.