Some threads about suggestions/improvements that I thought would be good to mention atleast once, and decided against bumping all these threads. Hopefully IW has already memorized these threads, but just in case they haven't...
New Water spells, including interesting Waterways (coastal-to-coastal teleport) and ideas for different summons (from Nessie to Yeti to Nymphs to Crocodiles).
Suggestions to improve the Water Magic Discipline, another Water thread, many ideas seem same. Longer, has more ideas, but also more non-topic discussion. First mention of the Waterways above
New Item SuggestionsStarted by Saber Cherry back then. Some interesting ideas, many overpowered ideas and Arms of Steel.
AI thread (20 pages), started as AI improvements but turned to discussion about AI
AI troop building algorithm Not Tested
AI castle building algorithm Not Tested
Also, the Wishlist I made and linked to once, from my previous post. I thought about a thread, but decided against it.
Unfortunately I remember only those threads, and the 20-paged one didn't end so I had to give in looking through "suggestion" search.