Note: Some of what I say here may be well known to some of you, but I have included it in case there are more basic users browsing the forums.
The problem is that as the system evolves, new features will be added (take Music, for example) that would then have people wanting additional buttons for those functions. Even though the player hardware might be the same, the remote would be somewhat obsolete once new features are added. Sure, you don't need discrete buttons for the Music List, Music Cover Art, etc but people would ask for it especially given the system's price. So they then have to roll out a new remote each time or offer something that can grow.
There are all hard buttoned remotes which have flexibility. The one that comes with my MC-12 has 3 zone buttons and a shift button which allow for the other buttons to do multiple actions. In the case of the MC-12, some buttons didn't have an alternate command in the shift mode and were therefore "reserved for future use" so that they could be added when the firmware is upgraded with new features. The problem there is that it's so hard to remember what those shifted functions are. So I, like many other Lex owners, use a programmable remote instead with a display where we can name functions.
I prefer the Universal Remote Control line. Their remotes generally have quite a few hard buttons in addition to an LCD at the top for programmable functions that you can name. The line is very good, so much so that several HT manufacturers have rebranded one of Universal's models to offer with their surround processors. This, of course, allows those manufacturers to easily upgrade the configuration of the remote when new features are added. It also doubles as a great universal remote for the rest of your equipment of course.
So, the best solution for K would probably be a programmable remote. Since various users will have their own preferences as to which they like best, K probably decided that they shouldn't bother offering one. Instead, they give out the codes and even device layouts for several brands. Beyond that, the player is compatible with basic DVD codes for several brands so that you can buy cheap hard button universals to let the kids use.
Jeff