The Migrations PS commands (Enable-Migrations, Add-Migration, Update-Database, etc.) should have tab expansion (aka autocomplete or IntelliSense) enabled.

NuGet has first-class support for tab expansion. Module writers can enable it using Register-TabExpansion.

The following parameters are good candidates for tab expansion:
ProjectName,
StartUpProjectName,
ContextTypeName,
ConfigurationTypeName,
ConnectionStringName,
ConnectionProviderName,
SourceMigration,
TargetMigration