Why dont you just email me in future for this type of thing Vlad you have in the past! Or just go to Zbrush Central for EVERYTHING, saves me a job of typing LOL
Go to preferences, custom UI then hit enable custom, you can then select drag your icons or whatever with the ctrl key.
Also its worth making a default document size. Go to Document then set your size for your canvas then save the document as StartupDocument.ZBR in your zstartup folder in the Pixologic folder. Then go to prefs pallete again once you are done with everything and hit Config>Save UI
hold down Ctrl and click on the button or interface item you want to assign a hotkey to. A message should appear in the Notebar saying you can assign a hotkey. Press the key combination of your choice. To make sure that the hotkey remains available you must Store or Save it in Preferences:Hotkeys. Store is for Startup, Save for Custom.