Thank you for contacting us.
It would be best to incorporate your feedback with our PITS portal where you have the chance to further elaborate on your scenario and specific needs along with the chance to vote for them. On a separate note we will deliver Sitefinity 5.0 in about a month time that will include Forums without releasing a service pack for our 4.4 product.
Do you have any issues with setting up a search index for your custom modules? We do support search capabilities for custom modules at this stage, and we haven't received any significant drawbacks with its performance.
Thank you once again for contacting us, we look forward to hearing from you again.