I know that Shift + Number switches Hot Bars.
So, I would like to propose that "Shift + Number" can be toggled between switching Hot Bars and the function like Alt and Ctrl.
Just a thought.

If, by the above, you mean a fourth hotbar that can be Shift+# (or anything else that people assign to it) then I would agree.

Three mappable hotbars (i.e. only 36 slots) is pretty low.

I miss having AoC's 90+ mappable slots

Yes, what I wanted to say is that you said.

I have used 6 hotbars for my SK.

Six hot bars?!

You are deleting your ca's that are getting upgraded right? Once a spell is upgraded, at least after you get it bumped to Adept III or Master you don't need that hot button anymore. Not sure if you knew that or not. Cause, I have never needed more than 3 hotbars for my spells/ca's on all my toons.

I'm a SK with 5 full hotbars. Granted, I've got my charm slots hotkeyed for use items and both my Call of Neriak and Call of Ro, and the creature catalog button, but I can see going to 6 easy if I wanted to have some item-switching or a couple more utility abilities hotbarred.

1: the spells which I use frequently
2: the spells which I use frequently
3: the spells which I sometimes use
4: items(potions, totems and so on)
5: passive buff(Caress, Hunger and so on)
6: say macro(pull macro, charge macro, target macro and so on)

As I level up, hotbars will surely increase.

Ahhhhh.. ok.. that makes sense then. I thought you meant you had 5 for SK ca's exclusively. If you count all the non-relavent hotbars I have 10. XD

Sure but most of them you use when you die (to rebuff) or on rare occasions (like a druid using portals) and you just switch hotbars for a minute. I have the scroll visible on my last hotbar to get to those types.

Shift is used to swap your hotbars (same thing the spinner does). I use 8 or 9 hotbars on most of my chars, but I only have 4 visible in my UI. I just swap to the one I need when I need it.

I don't disagree with the desire for more mappable hotkeys. Just wanted to offer that as I find it very easy to do. Need to port? Shift + 6, cast spell, Shift + 1 back to main bar before port is even done casting.

As a Ranger, I have 5 full hotbars and they're all CA's, Stances, AA abilities, etc. The only items on my hotbars that aren't CA's/Skills are poisons and potions (I don't have any equipment hotbarred for swapping).

I could definately use a 6th, except I've found adding another to be too much clutter, even after shrinking down the hotbar's icon size, zero cell padding etc...

It gets annoying when you need to hotbutton a quest item you need to use on creatures and objects and have to temporarily remove something else.