It is not really "needed": if you don't put default value (@), or muiverb REG_SZ value there, the menu would name itself with the key name (computer management)... few keys there don't have that default value because they already have the good key name...but won't arm so feel free to add
notepad.exe should work. Maybe %windir%\system32 is missing from environment variables path? Thinking further %windir% variable might be missing to, so might be better to write whole path... "C:\Windows\system32\notepad.exe" or just adding system32 path to environment variables.
Dunno man, such a trivial matter to simply right click an icon and select unpin that I've never thought about it.
You can customize taskbar (icons and theirs placement) and save it as such using this key: Code: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Taskband If you add some 3rd party icons, then they have to be placed here first: Code: %AppData%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar