Double-space (or more) after command alias is no longer accepted, i.e. "f--home" (replace "-" with " " since GitHub is combining multiple spaces). Otherwise, command prevention routines (in Factions itself and in other plugins) can be bypassed. For example, preventing the "f-home" command wouldn't prevent anyone from using "f--home" or "f-----home" instead.

src/com/massivecraft/factions/zcore/MPlugin.java

@@ -199,6 +199,9 @@ public abstract class MPlugin extends JavaPlugin
 			
 			for (String alias : command.aliases)
 			{
+				// disallow double-space after alias, so specific commands can be prevented (preventing "f home" won't prevent "f  home")
+				if (commandString.startsWith(alias+"  ")) return false;
+
 				if (commandString.startsWith(alias+" ") || commandString.equals(alias))
 				{
 					List<String> args = new ArrayList<String>(Arrays.asList(commandString.split("\\s+")));