Toggle Shift on On Screen Keyboard

I am trying to select text using the on-screen keyboard, is there any way I can "lock" shift down so that I don't have to keep going back and selecting it?Windows has two ways to do this:1)By editing the registry to add shiftLock and then pressing the shift button twice on the physical keyboard2) Pressing shift 5 times to enable sticky keys

Both of these options don't work on the onscreen keyboard, because you can't press shift fast enough.Sending a "SENDKEYS" command will also not work, because its not pressing the actual key