What Hayt said does have some merit, currently you can do ctrl+# to swap to a page (e.g. ctrl+0 goes to page 10 on actionbar1)
Would need to add something like alt+# for the new pages 11-20
maybe ctrl-# and alt-# for actionbar1 1-20
and shift+ctrl-# and shift+alt-# for actionbar2 1-20
Yes, sorry, I'm talking more in terms of how to code this than how to use it and thus make confusion.
Currently, actions are a DB entry with 10 pages of 20 slots.
We have 2 options :
1 - Create a new DB entry with 10 pages and 20 slots and so have two independent DB entries, one for each actionbars
2 - Extend the current DB entry with 10 additional pages of 20 slots and display for actionbar#1 only the pages 1-10 and for actionbar#2 the pages 11-20
Both option are for the player exactly the same in terms of shortcuts, since each actionbar will have his own shortcuts to select the page (1-10) and to select the slot.