Would this also work if multiple modules want to extend this? I wrote a small slider module (https://bitbucket.org/zeitmacht/mod_zm_slider).

Which uses observe_admin_edit_blocks to register a new block type and provides a _admin_edit_block_li_...tpl and a _block_view_...tpl. But I need to put additional javascript/wires to the edit page, to provide custom functionality. Specifically:
https://bitbucket.org/zeitmacht/mod_zm_slider/src/7ce1712190a341baa911d4763d1869b97d5bd1dc/templates/_admin_edit_blocks_additional.tpl?at=master

Would there be any better way to do this? I guess I could put this somewhere else so that it gets included on the edit page.