It's just an idea but...
...how about creating a drag-down hotbar border that makes as many or as few hotbars visible as the player wants (or the screen size permits LOL). It wld also help saving hotbar space if you brought back the classical combat HUD instead of dragging the tactics into the hotbars
Shift+# works very well, if you ask me.
I keep Speed, Power, Grab, Block, Withdraw, Desperation, Adrenaline, Consistent, Empty, and Clear all on Bar #20, so I click down two bars for my lower one. Then I shift between my other four. Using macros for my loadouts, I keep my Upgrades on Bar #1 along with my Hyper abilities and Determination. I also keep pills and Mobius there. On #2 I have my damage modifiers like Firearms Expert, Analyze Weakness, etc. and on #3 Duelist, #4 Rifleman, #5 SMG's, #6 MKT, #7 UGM, #8 Healer, #9 Expiremental, #10 Coder. Plenty of hotbars.
we ned more hotbars, make a complete row at the bottom of the screen and one row on the side like in WoW
putting buffs, pills, clothing, macros, and saving Hotbar for abilities
WoW is $hit but the mods people come up with is nice.
Double clicking consumables from your inventory pannel will also free up some hotbar space.
can be too much stuff on the screen as it is. 2 hotbars are fine for me