I'll try address your points as best as possible in one post apologise if I miss anything..
1.) I like this idea, although it doesn't take long to run between the patches a teleport would be convenient and helpful
2.) I honestly cant say I've done dragonstone jewellery crafting so can't say I know the levels but I'm sure this would be an easy fix.
3.)I agree the fletching exp could be upscaled but if you have the perk it isn't so bad but obviously we don't want p2w.
5.) The death tile issue is something we have been looking into for a fair bit now, we believe we're slowly making progress but it's been far more difficult than anticipated locating the source and finding a way to fix it, but be assured we are trying.
6.) I think sirenic has been buffed if im correct, either that or superior elite was nerfed a lil to solve this issue, see the latest patch notes.
7.) Also in the latest patch runespan nodes were added to spawn in more locations and more often, however I haven't tested so can't advise how good they currently are.
8&9.) I'm sure both of these can be looked into by the devs, probably won't be on the top list of priorities.
10.) I'd love to see the butler implemented into con would make it much better, however I don't think the bank command should be added as it would be ridiculously overpowered.
Sorry if some of my answers were a bit blunt but yeah there's my 2 cents 🙂