Some things I'd like to see in a dripper:
Two caps. One bigger for either a dual coil and/or drilling two airholes for dual coil, or for having the option of a bigger chamber vape and a smaller chamber vape.
Some adjustment of resistance (maybe separate from the actual coil). There's a rather wide margin between, say .9Ω and the 1.3 that will work on a regulated device. I hate when I build something and land on 1.1Ω! Too whimpy for my mech and won't fire on my VV. (If only I could increase the resistance enough to run it on the VAMO)
A cap shape that would accomodate (and an attie that would include) an air hole adjustment/occlusion ring). Translate this idea to an IGO shaped cap . . . .

Nice tall posts with wire holes down low: so you can build in the bottom of the well, or up high (using the post screws at the top). Posts located @ 10 and 2 o'clock. Nothing in the center, nothing on one hole half of the atty.
hmmmmm . . . . . .I'll let you know if I think of anything else.