Updated to 1.10.0, with the following changes:
Added support for ActionType 4, Run As Client (suggested by @Guih). Allows to run different clients with custom buttons, such as RAG+SAK.
Added support for ActionType 5, Minimize (suggested by @rakuzas).
Added support for saving password in addition to the username (suggested by @Lady Raga). This works only on Windows XP and newer (Credential Manager*). You have to configure ConfigID and CheckSavePassword settings to enable it.
Removed 'Replay' button. The custom buttons provide all functionality to replicate it.
* If you use the credential manager control panel (Windows Vista and newer) to change the password, the associated username will get lost, thus the credential will no longer be recognized. Also note, that the password is available to any application that requests it through the API.