Click Camera Photo using Bluetooth playpause button or wired headset button
Redial To Last dialed number using Bluetooth button or wired headset button


Only For rooted users Download tihs zip http://d-h.st/V6D
and extract install all apk configure xposed installer first more info go here Xposed

than activate xposed additions module reboot
than connect your bluetooth headset and wired headset what ever is available
press on add new key press wired headset playpause button it will show headset hook press ok go inside headset hook add condition load apps from list than select camera app one or many up 2u
than go inside app tick on click action than select camera now u can click image when ever you open camera app using wired headset button... now come to bluetooth button ..
again click on add key press BT play pause button it will show as media play Go inside media play and do the same thing again ... now u can use your play pause button as your camera shutter key.. you can even use your power button or volume button as your camera button just press add key than press the key u want than do the same ...

For Redial using bluetooth key go to headset droid
you can find that setting there...