Opera allows you to easily drag-n-drop custom buttons from a web page straight onto your toolbars!
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How to add a button - Simply drag a link to your toolbar and try it out (hint: drag upwards). A requestor will pop up asking whether to install the button (displaying the command the button performs to confirm 'what-it-says-is-what-it-does').
How to remove a button - Right-click on the button you would like to remove and click "Remove From Toolbar".
How to edit a button - Here's a quick way to change a button without editing toolbar.ini: instead of dragging from the installer pseudolink (as it actually is) to a toolbar, bookmark it. The button-defining URL is captured - rightclick the bookmark, and select Edit Properties: by editing what's in the bookmark's URL field you can change the icon or modify the action - then drag from the bookmark to a toolbar to install the changed button. (Bookmarked installer URLs also provide an unlimited and organizable way to store buttons.)
Where to place buttons - The Personal bar and Menu bar do not allow buttons to be added to them, but the Status bar, Main bar, Navigation bar, Address bar, the ends of the Page bar, most Panel toolbars and the Mail View bars are all fine.
How to create your own - If you want to make your own buttons, their syntax and all available commands can be found in AllActions. See the list of Button Creating Tools for more information, more custom buttons and some tools that make it easier to create your own buttons. For advanced information on making buttons without tools, visit the AdvancedToolbarINIGuide.
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You can make your main menu display as a button, then turn off the menu bar (you now need to create a keyboard command mapped to "Enable menu bar | Disable menu bar" to do this, or use of the toggle buttons below) to save space:
Other menu buttons:
[Mark read menu] Item, 44004 = Mark as read Item, 44005 = Mark as unread Item, 67362 = Mark all as read Item, 67354 = Mark and select next unread
[Reply menu] Item, 26529=Reply Item, 26530=Reply all
[Read Mail Menu] Item, "Open Mail" = Read mail & View hotlist, 7 & Focus panel, "Mail" Item, "Close Mail" = View hotlist & Close page
Note: There is currently a regression in V7.5 and V8.0 that stops scroll bars toggling automatically, please use CTRL+F7 for the moment.
Note: adding scrollbars doesn't work for me (Opera 10) unless there's a delay; delay,1 suffices. E.g. Fullscreen (delay)+ scrollbars
Same as above with added action when holding mouse over button (V8+)
*Hidden Menu - Hold mouse over button to activate
Management dialogs (Some more can be found in the security buttons section):