boQwI' gives you an option of using k -> {q} or {Q}, is that something feasible on your end?
I prefer to use boQwI' with k -> {Q}, since I can just use q for {q}. But I have noticed that some fonts use k for {q} and q for {Q} (or, technically, they use K for {q} and Q for {Q}, since the fonts map pIqaD to capital letters). I think I might be in the minority on this one.
Everyone keeps talking about fonts but that's only relevant if you're typesetting {pIqaD}, presumably on your PC (or laptop).
Many people (maybe most, in some demographics) are primarily on their mobile devices. The advantage of the "k" -> {Q} mapping is that it's effectively "optional" on soft keyboards: if you type Klingon as you normally would, you wouldn't even notice it was enabled. However, {Q} and {'} are on shifted keys, and mapping "k" and "z" to them allows a user to type them without shifting, which is a nuisance on a small device. It's also handy to be able to type "x" for {tlh} and drop "h" when its presence is unambiguous (like after "c"). With the "k" -> {Q} mapping, you can leave "xifan hol" mode on and the typical user (who knows nothing about font mappings) won't be confused when they're typing things in as-is. That's why that's the default, and swapping {q} and {Q} (i.e., "k" -> {q}, "q" -> {Q}) is an advanced option.