mart,
Yes, you can.
1. Make sure that "Windows Script Engines" (or better "Windows Script Engines - Hotfix Q824704") is in your image. For you custom
component it is better to set a dependency on the "Windows Script Engines - Hotfix Q824704".
2. Make sure you properly call your script (right command like "wscript.exe //B ...") from "Generic FBA Command" and the FBA phase
should be set to a value that is bigger than the FBA Phase value of "Windows Script Engines - Hotfix Q824704" component resources
(4500, AFAIK).
3. There is a registry bug of the wscript component which may not be relevant to your problem now. However, search this NG archive
for more info.