I have a few suggestions that would make the game a bit better.
1. Make the chain on the first level of the slayer tower work. Makes it faster to go to the top level.
2. Make some items like pestle and mortar, few of the herblore tertiaries, normal logs, frost dragon bones, other important items which I can't get my mind on at the moment buyable from G.E.
3. Make bank tabs so we can organise our banks.
4. Make the Dark Beasts in the Slayer Tower unagressive. The Dark Beasts are agressive and the Abyssal Demons aren't, which makes it very difficult to focus on Abyssal Demons only.
5. Make the other pouches, past Evil Turnip possible to be made when training Summoning. So far Evil Turnip is the best possible pouch to make. Also change the prices of empty pouches and spirit shards because they are extremely pricy at the moment.
6. Make it possible to use bones on the altar at home, for better exp. The exp rates of prayer are quite low at the moment.