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Can you please elaborate your requirement and let me know why you want to change the default UI.
I suggest you to review the below documents to understand the Editing Capabilities Using Composer
As suggested by Sreedhar-Oracle, this document helps to go through the composer capabilities.
Also most of the edit functionalities are performed by default composed provided by framework. So there is no requirements as such to customize it.
The UI of Oracle Composer can not be customizable yet. Just add buttons and new functionality, but you can not change the Look & Feel.
Open an Oracle-SR asking for an enhancement request if you think that this is a desirable feature for future versions.
I hope this helps.