There's a few terms we haven't yet crosswalked that could be useful and would I think be easy to add. e.g. from SoftwareApplication:

• releaseNotes
• runtimePlatform
• fileSize
• applicationCategory, maybe also applicationSubCategory ?
• supportingData
• softwareVersion (in addition to havingversion which we already have (from CreativeWork))

and inherited terms from CreativeWork / Thing:

• producer
• sponsor
• sameAs
• encoding

Probably not useful terms from SoftwareApplication, that nevertheless do crosswalk for certain vocabs (node package.json)

• processorRequirements
• memoryRequirements
• fileFormat
• storageRequirements
• permissions

Also from SoftwareSourceCode:

• targetProduct (e.g. identify the corresponding SoftwareApplication?), though I think we prefer to blend the difference between source and application here...