More archive formats please!

It works great for Zip & Unzip, but I would like if it supported additional Mac/Unix formats like gZip for unzipping. It would also be handy to be able to specify a file should be encrypted when saving a zip and/or when dropping onto the zip window vs having to use the Add button or drop on the dock icon to get the option.

jeffcraighead about WinZip - Zip, unzip, protect