Minimum # of Prefixes per topic; user-uneditable tags

Have 2 suggestions:

1. Is there a possibility to include a setting where it's possible to define minimum number of Prefixes per topic - similar to the maximum allowed? I understand that by defining default the minimum can be set at 1 prefix, however, if this number can be defined under settings it could help further refining possibilities in several use-cases.
2. The tags could be predefined by the forum admin and instead of random additions to the tag universe, a setting can be disabled such that a member posting only has an option to select from the pre-defined tags which get suggested as he types. This can greatly help in reducing the clutter that many users have complained about and possibly give more control over organizing the posts..

Thanks!