It is a great idea that will be used alot just like it is in forums, so I think it should be included.
The three options of how to implement it are
1) A fake command that tells the user to use a space, or
2) A command in the right click menu called sticky that will make it appear at the top of the folder. With this option you could even include a symbol that expands to [stickied]%stickied% and use it to show in th template it is stickied eg, different colours, icons...
3) Include a Hints/Tips section in the help menu which would include tips for hfs, such as useing a space, etc
Option 2 would be the best for simplicity but in the end its upto what everyone else thinks is best but mainly its rejettos choice because hes the one who creates hfs
