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That's dependent on tricking your opponent in real life into believing that they're normal Glade Guard, and not Scouts. A lot of players/groups expect people to declare what units are as they deploy them.

Also, Glade Guard (non-scouts) are minimum unit size 10, so even if your local group is cool with this kind of trickery, you're going to have to spend 170pts in a max-size unit of Scouts to pull off this subterfuge. Scouts lose the S4 longbows, so that's a LOT of points on a unit which doesn't fight very well.

What you're much better off doing is taking a minimum-sized unit (5 cost 85pts) and using them for their traditional duties- scouting and march blocking. Actually, the way skirmishers flee from charges, you can use them VERY well for diverting enemy units without having to trick your opponent at all.

Here's the 7th edition FAQ, which explains the rule:

http://us.games-workshop.com/errata/assets/warhammer_v7_faq.pdf

And here's a discussion thread which explains how you use it:

http://warmongerboard.yuku.com/topic/4623

The downside to that is, that IME, I'm just as likely to forget as my opponent is!