Maybe Vapcell can offer an 8-bay charger based upon the upgraded S4+ charger. Four of these bays could then be used for 26650 batteries. I am pretty sure that there is demand for an "S8+" charger as we get so see some flashlights that need 8 cells (Lumintop GT series for example).
Having the ring/beep/buzzer tone in automatic mode only but not in manual mode is not really what I was hoping for. In most typical charging scenarios the user just want batteries topped up to 100% again, regardless of automatic or manual mode. The problem I see here is the noise that drives many men's wives into madness because they were just watching their favorite TV series or they were taking a nap on the couch*. Guess the look of their faces when the beep comes up again. ;-)
So, a cheap straighforward-solution would be a (hidden) press-button-combination to turn the ring tone on and off. More sophisticated would be to see in the display if it's switched on or off (bell symbol?). I don't know, I just want to state some recommendations how to make a good charger a great charger.
* I did not mean to offend anyone or anyone's wife here. It's just a metaphorical illustration how things can be in people's living rooms. :-P