You cannot edit DNN 3.2.2 (or the DNN modules included) with VS2005, but you can run DNN 3.2.0+ on ASP 2.0 w/o limitations.
To edit DNN with VS 2005 upgrade to DNN 4.0.3, but be aware, that changes in the core will get overwritten dirung updates. Be also aware, that all content modules, that come with DNN 4 are developed using ASP1.1 an VS2003, so you will need to convert them to ASP2.0 before you want to edit them in VS2005. You can however write your own modules using VS 2005 but be aware that they will not run on DNN 3