Why not use the trace keyboard? I know Sense 5 on the HTC One comes with a trace keyboard option. It might take a bit of learning to get used to, but using trace keyboards seems to be a lot faster and more efficient than clicking on small physical keyboard buttons. Then again, they don't provide the tactile feedback that a physical keyboard does, so you can't really type with muscle memory and have to look at the screen when trace-typing.
>> you can't really type with muscle memory and have to look at the screen when trace-typing.
I used to be a devout BlackBerry user, and could happily type out entire emails in meetings with my device under the table, send then, and be 100% confident that I had typed what I was planning on typing. Likewise I could type while walking, and only glance down to see what my incoming messages were. In many jobs, the ability to do that is essential to success. I can't come near that with any type of soft keyboard.
Having said all that, I don't use a BB any more - my 9900 died, and I bought a Nexus 4. I was looking at a Q10, but it was $300 more expensive than the Nexus, it still doesn't have anywhere near the number of apps, and I was no longer in a place in life where the key BB features - BBM and the ability to type long emails without looking - mattered any more.
