What do you think? I like this a lot. Being able to shift and drag would be an awesome feature. How likely is Apple to implement this? I'm not sure. We've seen this done on regular laptop keyboards and with the mouse. So, it isn't as if Apple will be implementing something totally new like their copy-cut-paste scheme.
Personally, I've been training myself to do more dictation. It has saved me a lot of time and, over time, I've gotten a more natural feel for it.