We use Telerik reports for many different things.  We generate reports, letters, mailings, excel documents and forms or applications.  Our applications can either be blank or pre-filled or completely filled with information from the user.  Now I realize that you can say that all of these are forms of reports, but I would submit that is only partly correct.  I tell people that Telerik reports is a way for me to produce output that can be electronically distributed or printed.  While that is a definition of a report, I think it can go a bit further.

If you think about PDF forms and what they are, they are a report that allows the user to add additional information and send back to the customer.  I do realize that some features of PDF forms allow for scripting that can automatically submit, and there is a lot of other capabilities that moves PDF forms outside the realm of basic report generation. That being said, the ability to set a parameter in a report whereas the fields are replaced with basic text input PDF fields would be a huge advantage for Telerik.  I could see them opening up the forms generation market for this product.

While I have no input into your roadmap and, as a former Product Architect for a software development firm, I fully understand scope creep and keeping product focus, I would love to see:
1) a parameter export to PDF that converts the fields (everything that has a Fields.XXXX keyword somewhere in the value property) to PDF form text fields without adding data.  I would set the length the same way you set the horizontal length of the field on the report.
2) a parameter on a field item that says this field cannot be converted into a form field and must have data.
3) a parameter on reports indicating that when generating PDF form fields, that X number of rows are generated for the detail section.
4) if a field value is too complex or if the report is too complex, I would just fail over to a blank value.
I realize there are a lot of capabilities in PDF forms, but I tried to keep my wish list confined to the basics that would allow for easy additions to support advanced capabilities post report generation.

All this being said, I have communicated to my customers that Telerik is not going to support PDF form fields and we have an upcoming meeting to discuss this requirement.  I have a lot of resources, time and money invested in the development of Telerik reports and it is a concern that I may have to remove Telerik reports from our solutions because of a need to support this PDF capability.  We have reports on multiple different platforms and I feel that Telerik Reports is one of the best in terms of use on many different styles of applications. But since I am a firm believer in using as few technology vendors as possible (and only want a single reporting solution), I am concerned about having to re-architect our solution reporting infrastructure to remove Telerik reports.