Sub-project donation

[Waldemar Bergstreiser <wbr@xxxxxxxxxxxxxxxx>]

 Hi folk,

I would like to support some sub-projects by a small donation and I have 
seen a "code bounty" page
but it seems that "bountys" can be set only by a developer. Did you 
already considered opening sub-project related donation for public. And 
probably some voting system can also be very useful.
Anyway, a main question: how can I make a donation for a hammer 
improvement, e.g. compression or dedupe?