HOW TO REMAP SEARCH KEY TO GOOGLE SEARCH DIRECT VOICE PROMPT
This worked for me on stock Android 4.1.2 rooted, remember backup before you edit:
2. Edit /system/usr/keylayout/cy8c201xx.kl
3. Change from
key 217 SEARCH WAKE_DROPPED VIRTUAL
key 217 VOICE WAKE_DROPPED VIRTUAL
4. Save and reboot
Does spaz a bit on long press, but short press it will FINALLY let you choose an app.....and don't be fooled, choosing Google doesnt bring up the general Google Search with all the cards and crap, its just a voice prompt directly to the new Google voice search...exactly what i needed. Again only short press works but it's awesome having the nice, accurate voice commands back from 4.0 and older Android released on RAZR when long press search key worked. May take a few selections and selecting "always" a couple times, then reboot for it to hold.