Do the right thing and install Opera 10.
Right. Now do you know if it is possible to remove the Opera icon from system tray?
In the program shortcut path, just type the argument "-notrayicon" in linux, and "/notrayicon" in Windows. Then opening the icon will do what you want. Dont ask me how to do this globally. I'm still searching how to do this.
As for Alt+S, in Opera, if you press Shift+Esc, you'll get the access keys, and then pressing S does the Alt+S function. But Tab+Sapce is much easier as Asif said.
@Ze: Opera doesnt need Addons, cos it has a whole wealth of features OOtB. But if you really want some plugins, then install what Opera calls Widgets. Dont bother comparing them with the FF addons.