I like having a small laptop in terms in screensize/footprint, but I really don't mind a thick or heavy laptop at all. My thinkpad x220 tablet with the slice battery is about 3 inches thick, and is about 4-5 pounds heavy. Thought I would remove the slice at times when i felt it was too heavy or thick. Nope. I just leave it on. I certainly wouldn't mind adding an extra inch or so and an extra pound to include a mechanical keyboard. As long as I can balance it on one knee and carry it with one hand, it's small enough for me.
I can do without the "gaming" stuff, however.