I agree that it is bad to transmit the message that those who contribute will get paid for every line of code or for every other little contribution for that matter.
We need working groups that are in the basis based on voluntary work. There are however many ways to insentivise community members to contribute and make the process fun.
E.g. win a Grin bounty with your awesome Grin video tutorials, win a meme contest, a wallpaper contest or general art contest with Grin or Grin goodies such as stickers, T-shirts, caps or others as bounties. Or how about having Grin Raspberry Pi nodes as bounty for helping to debug the node or wallet software?
All of the above examples have in common that there is an intensive, its fun and nice to contribute, but the incentive is from a financial point of view not comparable to hiring people. Personally I think this would be a great way to balance not ‘paying’ for every little contribution, while at the same time incentivizing and showing appreciation to community members work. I for one, would love a Grin T-shirt to wear to the many crypto events I visit and would feel motivate to do my part for the project, and I think I am alone in this 
One way we could organize working groups is by giving tokens of appreciation as discussed above, as well as having dedicated key-base channels for working groups. One thing that we did not have in the past is a medium to have dedicated discussions as working group.
For the fun of it, find below a link to a post from 2019 when working groups were discussed as part of ‘the next step’ of Grin governance, it is a good read 
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Regarding the wish-list, it already is on github with some ranking, we could indeed link out to individual github’s as @stakerV suggested, so people can start thinking about them in more detail and convert these ideas in actionable proposals.