Might be a better way (and there may be unintended side-effects of this), but from poking around a bit:
Settings, Shortcut Mapper, Plugin Commands, 49 Q:Mark Word or Find Reverse, Modify, then Choose your Shortcut Combination.
Note that Ctrl-W is close by default in Notepad++, so unmap that first (Shortcut mapper, Main Menu) if you want to use that.
Edit: After ten more seconds of poking around, the crippling unintended side-effect of this solution is somewhat obvious. Namely, try this is a test test and then try select test. ;) Sorry.
1Mark Word or find Reverse not anymore available there... – florian.isopp – 2016-07-27T12:57:16.073
@florian.isopp I think the command might be found in the "Scintilla" tab of the Shortcut Mapper. Here is a page that presents those commands: http://docs.notepad-plus-plus.org/index.php/Moving_And_Selecting_Around
– wip – 2017-06-16T03:44:22.360I think @Patches answer should be marked as the accepted answer, anyone else agree? – Chagai Friedlander – 2020-02-14T21:31:35.923
That works fine for me – x2. – 2011-03-25T05:25:51.793
I've read about test test(think it's regex problem ot something) and now don't know what better macro or that decision :( – x2. – 2011-03-25T05:38:05.870