Is it necessary to enable the 'tab' key to jump from one TWebEdit to the next ?  When pressing the tab key the cursor stays in the current TWebEdit component.

also the backspace key does not work in the TWebEdit component, only the delete key appears to be working ! (when operating in the browser)?

I cannot reproduce this.
Do you use TWebEdit with default settings or some specific settings / event handlers?
What specific browser do you use?