[Hobbes]

Wouldn't such a feature make combat hacking more valuable?

No, you'd simply run everything wireless off until the moment you needed to use the wireless bonus.  Free action flip it on, do the thing, free action on your next pass to turn it off.  Hackers would never even get a mark placed.

Also Perfect Time quality would make your gun hacker proof.  Turn on wireless, shoot, turn off wireless all in your turn.  You can already do this if you've got the weapon linked to a datajack. 

You can already sorta do this but it's consuming a Simple action to turn it on.  Plays heck with your action economy. 

[Hobbes]

IMO you can Send Message to your device to command it to turn wireless on.

Send Message is a Matrix action, if the device isn't connected to the Matrix (Wireless off) how would the device get the message.  If you've got it jacked into via a datajack / UDP then sure.  But in your pocket, wireless off, you need to spend the simple action to turn Wireless on.

[Strange]

IMO you can Send Message to your device to command it to turn wireless on.

Send Message is a Matrix action, if the device isn't connected to the Matrix (Wireless off) how would the device get the message.  If you've got it jacked into via a datajack / UDP then sure.  But in your pocket, wireless off, you need to spend the simple action to turn Wireless on.

Just like if your cell phone is in airplane mode (wireless off) you cannot receive your email.  Or your Laptop.  The list goes on!