I believe the function you're looking for is split-window-sensibly. Try
M-x describe-function split-window-sensibly. It describes all the
relevant variables that control its behavior.
If you wish to affect the behavior of only a specific case of splitting
windows (for example, the org-todo function) you can use advice to
temporarily modify one or more of these variables for the duration of
the function call. For example, the following (untested!) code should
guarantee a vertical split for org-todo:
(defadvice org-todo (around tweak-splitting-behavior activate)
"Tweak the sensible window splitting behavior for org-todo."
(let ((split-height-threshold 0))
ad-do-it))
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