This index contains all customizable options of ECB:
ecb-activate-before-layout-draw-hook
ecb-activate-before-new-frame-created-hook
ecb-activate-hook
ecb-add-path-for-not-matching-files
ecb-advice-window-functions
ecb-auto-activate
ecb-auto-compatibility-check
ecb-auto-expand-directory-tree
ecb-auto-update-methods-after-save
ecb-bucket-token-display
ecb-cache-directory-contents
ecb-clear-history-behavior
ecb-compile-window-enlarge-by-select
ecb-compile-window-height
ecb-compile-window-temporally-enlarge
ecb-current-buffer-sync-hook
ecb-deactivate-hook
ecb-debug-mode
ecb-directories-buffer-name
ecb-directories-general-face
ecb-directory-face
ecb-download-delete-archive
ecb-download-url
ecb-download-version
ecb-exclude-parents-regexp
ecb-excluded-directories-regexp
ecb-font-lock-tokens
ecb-help-html-path
ecb-help-info-path
ecb-hide-ecb-windows-hook
ecb-highlight-token-header-after-jump
ecb-highlight-token-with-point
ecb-highlight-token-with-point-delay
ecb-history-buffer-name
ecb-history-face
ecb-history-general-face
ecb-history-item-name
ecb-key-map
ecb-kill-buffer-clears-history
ecb-layout-always-operate-in-edit-window
ecb-layout-nr
ecb-layout-switch-to-compilation-window
ecb-layout-window-sizes
ecb-major-modes-activate
ecb-major-modes-deactivate
ecb-method-face
ecb-methods-buffer-name
ecb-methods-general-face
ecb-minor-mode-text
ecb-mode-line-prefixes
ecb-new-ecb-frame
ecb-other-window-jump-behavior
ecb-post-process-semantic-tokenlist
ecb-primary-mouse-jump-destination
ecb-primary-secondary-mouse-buttons
ecb-redraw-layout-quickly
ecb-scroll-window-after-jump
ecb-select-edit-window-on-redraw
ecb-show-ecb-windows-hook
ecb-show-help-format
ecb-show-node-info-in-minibuffer
ecb-show-only-positioned-tokens
ecb-show-source-file-extension
ecb-show-sources-in-directories-buffer
ecb-show-tokens
ecb-sort-history-items
ecb-source-face
ecb-source-file-regexps
ecb-source-in-directories-buffer-face
ecb-source-path
ecb-sources-buffer-name
ecb-sources-general-face
ecb-sources-sort-method
ecb-split-edit-window
ecb-temp-dir
ecb-toggle-layout-sequence
ecb-token-display-function
ecb-token-header-face
ecb-token-jump-narrow
ecb-token-jump-sets-mark
ecb-tree-expand-symbol-before
ecb-tree-incremental-search
ecb-tree-indent
ecb-tree-navigation-by-arrow
ecb-tree-RET-selects-edit-window
ecb-truncate-lines
ecb-truncate-long-names
ecb-type-token-display
ecb-use-recursive-edit
ecb-version-check
ecb-window-sync
ecb-window-sync-delay
ecb-windows-height
ecb-windows-width