I posted this same solution elsewhere in the Groups, you should search before posting.
I've written an applescript which sends your current selection in just about any application to QS. I haven't missed the old QS function since switching the script. Meanwhile the script works every time, solidly, immediately, and I can slim my catalog down/speed it up by turning off Proxy Objects. You can grab the script, qsGetSel, here: http://is.gd/aZ9wQ Unzip it, move it to "~/Library/Scripts/" (where "~" is your home folder), restart QS, activate QS, type qsGetSel and it should come up, tab over, and type till you see "run" that should work. set that up as a trigger and you should be good. To unsubscribe from this group, send email to blacktree-quicksilver+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
