I'm not into this right now, but:

1)>>
Default subclassing:
  this is probably more or less because i'm inserting 'layout' window into layout window,
  is there an easy way to use this, so default subclassing works as expected?

2)>>
It turned out it was easier to use like it is,without any translation tables - just directly(if keyCh<65536...),
  but that 'keys used independently' may come handy sometimes,
  aha, for confusing part and K_SHIFT|K_2