Having been asked for my thoughts, here are a few things that I think could be helpful in the game and the reasons behind them;
The ability to “private message” another player - this should in theory just need an extra button on the View Profile page and would be a lot of help to us all.
Chat Thread Moderators - I very rarely go into Global due to the amount of spamming/racism/bullying that I see. If experienced players were appointed as Mods then this could benefit everyone.
Alchemy Lab - as mentioned on another thread, we have hundreds of useless items in our inventories. The ability to use them similar to th Barracks for troops would be great.
Reduced Wait Time Tokens - similar to Summon Tokens, these can be bought or won from chests/missions but reduce build or wait times by specified amounts. When you have to wait over a week for a build then these would be very appealing!
A monthly membership option - players could pay a monthly amount (for example £19.99) and receive a loot drop at the beginning of every month containing gems and items for use in game, as well as other benefits such as reduced build times, timer cooldowns etc.
Alliance wars, or Player vs. Player battles - more incentive for players to boost their alliance or test their strength against each other. Alliances could also gain points and rewards and these in turn would benefit their members and reward those that have been playing the game a long time, or indeed choose to spend a lot of money on it.
Just a few thoughts, but feel free to add more!