Our apologies for the late response.
We have discussed breaking the forum down into more dedicated sections for each model but believe that this would be extremely difficult and could lead to many broken threads.
However, we are constantly looking to improve the site on an ongoing basis (new front end, news and video sections have just been introduced as well as shifting the site over to 'https' for added security) and will hopefully keep introducing new aspects to improve the overall user experience.
With regards to the search facilities. Not sure if you have tried this to enhance the search but if you click on 'Advanced Search' in the search bar, top right of the page and it brings up further search options....may be useful to find what you're looking for?