I want to offer some ideas.
1) There are a lot of programms that can protect folders. For example - "Folder Guard", "Folder Protect", "MySecretFolder" and else. So, would be really good, if Sticky Password will have similar functionality. Because inconvenient use two programms if could have one programm with all functions.
2) Also would be good if you implement encryption of files. For example as the next programms "Cryptic Disk", "Ashampoo Magical Security 2", "Jetico BestCrypt", "Kaspersky KryptoStorage".
So, it will be very good, because all functions will be in one programm.