Keeping downloads/installation behind EULA seems controversial (with all the discussed pros and cons). But prohibiting (or even making it illegal?) to open an issue seems to disrupt how free software communities work. Of course you are free to delay feedback for e.g. 2 weeks (see free access to lwn.net) or not to answer at all or to mark such an issue and move it to discussions but not to limit feedback to your project in such a way.