Login Consultants tools are pretty popular among the App-V customers; the first is the App-V 4.5 Client Diagnostic and Configuration tool (ACDC). This one looks like it'll do a lot of really cool stuff, such as: Launch predefined and custom commands within the virtual environment of each application; See the impact of the App-V Client and the available virtual applications on your system by calculating package size, cache size, user delta file size, log file size etc.
More info: ADDC
The second is the App-V 4.5 Add-on ADM v1.0. As I'm sure you already know, we have our own Administrative Template for the App-V 4.5 Client which can be downloaded, but this one lets you manage some additional App-V 4.5 Client settings.
More info: ADM