According to this page, HFS+ does not support spares files.
Oh. Thanks for info. Probably I have messed that up with extents. I thought that all FSs supporting extents do support sparse files. Not that I miss sparse files much. (*)
As to link pasting, I'd give my vote for one more tab in aMule window. I do not know how you do manage you ed2k links, but I keep my links in text file for now. The obvious problem, is that I do not have that much disk space to have everything in queue. And I do not like something hanging in paused/stopped state for too long.
So, in addition to ed2k link pase and drag'n'drop, I'd suggest adding one more tab, let's code name it "Linkpad", where one will be able to store ed2k links. One can add link manually of from search results. There sould be possibility to annotate ed2k link. Then one can click on link(a) and choose to download it/them. Linkpad content would be saved to disk say in specially formatted html file - but still possible to open with web browser and see the links and comments.
Optional grouping for the links will be lovely too - with moving/copying link from one group to another. This way I would be able to save links for the files I have already downloaded in separate group - so they will not bother me and will be available if I will need them some time later.
As for me, such "Linkpad" feature will absolete link pasting and dropping - I will just keep my links inside of aMule then.
(*) With sparse files, one never knows true hard drive space requirements. I have had a situation, when copied files over nfs to server: server run out of space. As it turned out, directory had a very huge sparse file. "du -sh ." gave obviously disk usage, but not the total size.