"regular functionality" is correct and usable in written English.
You can use it to describe a feature or system that operates in a normal and expected manner. For example, "This software comes with regular functionality, such as the ability to print, save, and export documents."
Users will have the regular functionality of PowerPoint, but with the ability to directly add content from the web (Google Images).
Retro initially disagreed, saying it would be difficult to implement the feature without dampening the entertainment value, but after discussion decided to turn Hyper Mode into a regular functionality of the game.
Due to slightly higher numbers in platelet count this effect may be compensated by keeping the platelet mass constant to sustain regular functionality.
On one hand, if they are restricted to nematodes, specific targeting will not affect the regular functionality of the homologous proteins in the hosts.
For the regular user, the password entering system is the only visible functionality.
And there's the new OpenCL, which opens a computer's graphics power to also be used for regular computing functionality.
In another step, to bridge the gap between the database and ease of use, auto completion and regular expression functionality has been added.
The accession 'By Name' page allows researchers to search through all accessions using only one or two letters of the name through the adoption of auto-completion and regular expression functionality.
Earwear, often labelled 'hearables', include devices that bring additional functionality to a regular pair of earphones, syncing with various smartphone application.
There is also a Facebook "app" that recreates much of the regular site's functionality but allows you to share favorite apps with your friends.
Given that Pinterest's discovery mechanisms today include a basic category list, search box, and "find friends" functionality, regular users have likely been looking forward to the introduction of new features that would allow them to better explore more of Pinterest.
