We have hotkeys for stepping and continue, it looks logical to have one for script pause.
There is a user request for this: http://groups.google.com/a/chromium.org/group/chromium-discuss/browse_thread/thread/c5bde640f8281002/63410885d71aef6d
F8 is the key, as it is bound to the Pause/Continue button click handler. If the same key for the two actions is deemed OK, we just need to update the shortcuts help page.
Created attachment 91471 [details]
[PATCH] Suggested fix
This fixes the shortcuts help page for F8.
Attachment 91471 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/ChangeLog:8: Line contains tab character. [whitespace/tab] 
Source/WebCore/ChangeLog:9: Line contains tab character. [whitespace/tab] 
Total errors found: 2 in 2 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Committed r85179: <http://trac.webkit.org/changeset/85179>