Regarding hyperlinks on forms. In version 2.1 that has just been released we added support for DISPLAY URL action, so it is possible to define a process that calls this action. You can then call this process from either an HTML cell on a form or from the HTML code that you can add to the description of the attribute. The HTML can look like this:
<a href="updateEntity.do?actionMethod=startProcess&processName=GotoWebsite target="_blank">Go to</a>
This assumes that there is a GotoWebsite process defined that has the object whose form is being displayed as a parameter and that has the following action:
DISPLAY URL Object.Website