I tried to run Tabs Studio under VS 2005 with .NET 3.0 and C++ 2008 SP1 redistributable installed. The only problem I’ve found is a slight tabs displacement on initial loading. It is fixed by changing VS window size, for example. I enabled VS 2005 support in Tabs Studio add-in metadata, but I was not able to make a single .vsi installer for both VS 2005 and VS 2008 versions.
Download separate Tabs Studio 2005 v1.3.5 installer.