Be careful what you wish for. Overaggresive knurling will eat your clothing.
Clips break. I just opened my Tiablo A1 and closed my eyes and prayed to the flashlight gods as I popped the clip off. Did the same as I reversed it and popped it back on. I got lucky. Not all clips will.
+1 on better holsters. If you're going to use nylon, it needs to be ballistic. Period. And stretchy stuff doesn't cut it in today's working world. Put a cap on the darned things. I much prefer holsters over clips and rings btw, so I prefer more dev time go in to this, personally. Also, if you make better holsters, you can go with aggressive knurling if you want, as well
SOS and strobe, keep the function, but incorporate the P2D/P3D technology into your keychain lights. Yes, you heard me. Design a tailcap switch for your keychain lights. Were it highly dependable I personally believe this would be an industry first.
Do these things and I would gladly pay double what I pay now.