My main suggestions focus on skilling. In general skilling is a tedious grind that's just a hurdle on the way to max. The two main skills that feel tedious are Mining and FMing.
For firemaking I'd suggest bonfires. It's a simple solution to fix the most pointless skill. The added charms that come with bonfires would at least yeild something from firemaking.
My two favorite pieces of skilling content on OSRS are rooftops and motherlode mine. You added rooftops (which is fantastic btw!) Recently so agility isn't quiet as tedious now. Motherlode mine would fix the tediousness of the mining grind.
My next suggestion is the 200m construction cape perk feels so underwhelming. The cost to go from 99 to 200m is huge and all you get is a minor perk upgrade. I am not going to pretend to be an expert on game balance and what may be a balanced better perk but, as it is it's not great. There are other perks too that feel underwhelming such as the thieving cape etc. But I haven't put much thought into those.
I've also seen it mentioned elsewhere but the skilling pet drop rate definitely should be addressed. I defer to others who have much better ideas than I do on this topic.
Group ironman mode: this one I have put some real thought into. The biggest 2 issues with group ironman are: 1. Someone quitting and having stuff just chilling in their bank. 2. Getting a big drop and one person scamming the rest of the group.
For issue 1 the best solution I can think of is having a shared bank for the group. It may not be a perfect solution but, it would also make the mode more viable for those playing in different timezones.
Issue 2 is a bit more complex. The first solution is make it to where no one can deiron without the whole group agreeing to it and the second part is what about drop trading? Make it to where a group ironman can not drop items. Instead it just destroys the item.
Some more stuff added to POH: the number one thing I'd like to see added to a POH would be some skilling additions. We can already plant trees so make them choppable, maybe add some other skilling things like rocks to mine, fishing spots, a range, a furnace, and farming patches.
For farming add tree farming. It seems a missing piece to the skill. Also some more patches added.
The debuffs to ckeys etc. Seems to have swung the pendulum too far the other way. It doesn't even feel worth opening them now. It also devalues some achieves because that is the only reward besides the runex points.
A new minigame. One that's more co-operative than pvp related. Will add some interaction opportunities with this awesome community.
