- Cards do have stable URLs. Not sure why you think they don't.
- A Github url to a commit will link to that URL. Powerups can be used if you want tighter integration.
- Very few people actually need this. If you do, then you need a fully auditable system.
- Copy paste the card URL. Again, card URLs are stable and Trello will detect that it's a card URL.
- There are fairly extensive keyboard shortcuts: https://trello.com/shortcuts
- Such as?
- Boards -> Lists -> Cards -> Description/Comments/Check Lists/Polls/etc. At least 4 levels.
- Is this a prediction??
- Sounds like a Firefox problem.
- Are you putting logs in the titles of the cards?
- Such as?
- Haven't ever seen an ad in a card.
It sounds like you set out with the intention of not liking it and found (or made up?) reasons.