Such requests will be massively more powerful if they come with a promise of donation, even very small.

If you get 1000 requests in a day that you accept bitcoins on your site, versus if you get 1000 requests where 100 of them promise a donation of 0.1 bitcoins if they start accepting it, that's a huge difference in impact. Even though the total amount of these promises is only $50 USD, it makes people notice and really think about it if people are saying they want to donate X amount instead of just a request that they add a new feature but no promise.