Yes, you are right. There are no such default keys.
But you can simplify your calls.
# Switch between mailboxes (in case you have multiple mailboxes)
macro index,pager <f2> "<change-folder>+<MAILBOX1>/INBOX<enter>"
macro index,pager <f3> "<change-folder>+<MAILBOX2>/INBOX<enter>"
In addition to that I have the sibebar enabled and use the arrow keys to switch folders.
# Sidebar navigation
bind index,pager <down> sidebar-next
bind index,pager <up> sidebar-prev
bind index,pager <right> sidebar-open
EDIT: Here can find my whole
EDIT2: Regarding the comment to have conditional mappings: Yes this is possible in case the condition is another mail account. You can have account specific configuration files where you are able to overwrite existing mappings. Load them via a folder hook which get executed as soon as you enter a corresponding folder.
Put this in your
folder-hook MAILBOX1/* source ~/.mutt/accounts/MAILBOX1
folder-hook MAILBOX2/* source ~/.mutt/accounts/MAILBOX2
Create account specific configurations in
For example, switch between two different INBOX folders with the same key.
macro index,pager <f2> "<change-folder>+MAILBOX2/INBOX<enter>"
macro index,pager <f2> "<change-folder>+MAILBOX1/INBOX<enter>"