jira.bulk.edit.limit.issue.count is ignored if I specify a larger tempMax param for the page.
Assuming limit is 1000, I can use the following url to see all issues on the first page:
http://localhost:8090/jira/secure/views/bulkedit/BulkEdit1!default.jspa?reset=true&tempMax=123456
instead of "normal" http://localhost:8090/jira/secure/views/bulkedit/BulkEdit1!default.jspa?reset=true&tempMax=1500

It does not let you actually edit all issues (it complains after clicking Next), but the main reason for the limit is to prevent excessive resource use on that first page.