Thanks for your compliments for Ultra Recall!
We have previously referred to the type of linkage you are requesting as "wiki style" linking and we do have that capability on our todo list.
We agree that some type of tabbed interface or other way to view multiple Items would improve the useability of Ultra Recall and this is also on our todo list. You mention the need to "click" to navigate back and forth. Perhaps the Alt+Left arrow/Right arrow (Back/Forward respectively) might be of benefit to you...
While it is no substitute for the ability to view multiple items at once, we have focused on ensuring that all important functions are available directly from the keyboard. See
http://www.kinook.com/UR/Manual/keyboardshortcut.htm for the details on all documented keyboard shortcuts.