DynamicContextMenuService timeout

Generating the context menu may sometimes be very time-consuming (e.g. the context menu provided by SVN plugin in Eclipse). Please add a timeout to the dynamic context menu service, so that a plugin that takes a long time to generate its context menu will be ignored (for the specific context menu request) and not delay the entire context menu.
The timeout should preferably be configurable in the options, but a sensible hard-coded timeout is also fine.