The good news is that both of those features are planned
- User would like to have a fast smart search to find jobs from the dashboard https://issues.jenkins-ci.org/browse/JENKINS-38982
- User can run parametrised pipeline https://issues.jenkins-ci.org/browse/JENKINS-38805
Particularly for search, I'd recommend signing up to our JIRA and watching both of those issues. You will be able to get a notification for any proposed designs (we'd love to have a discussion with you on the final solution) and when the feature ships in a beta release.
About the search: there are many JS libraries which allow pagination, sorting and searching tables, so it might be fastest (and most user-friendly) to just use one of those. Well, as long as we-re talking about 100s of jobs and not 1000s... :) For instance, I had great fun dealing with DataTables  lately (needs jQuery). The advantage of this approach is that it takes half an hour tops to implement.