Creating Custom Actions for VBP 8

[HippyCraig]

In previous version I have a custom action that I pass a list of labels to and a custom VB dialag box appears that displays that list in a drop down, once selected it updates a macro in the calling script and continues. This works fine in Version 7, I just installed Version 8 on a new workstation and I want to upgrade that action to work with the newer version of Visual Build. Now that I got the background out, I will get to my questions:

First I want to write my action using VS2010 and Framwork 4.0 is this supported?

Second, since I have to refrence VisBuildSvr, I want to create two action one to support 32 bit and one for 64 bit. Do I need to create two seperate solutions one for each since some build machines are 32 bit only. Would I need the appropreate version of VBP installed in order to build each type?

Any suggestions would be great!