With the mini-find window active, click the downward pointing triangle next to the red cross (or use Alt F) and you get a menu - you can turn incremental search on and off etc. and Alt S is for set multiple cursors. Don't miss the "find all" sub-menu. It's not listed but Alt-L lists all occurrences in a search results window. Press F1 for help and you can see all the key settings. You can customize some key-bindings by fiddling with the following function in docsearch.e
void _document_search_form.'range-first-nonchar-key'-'all-range-last-nonchar-key'()
/* 'C-A'-'C-Z','c-s-a'-'c-s-z','c-a-a'-'c-a-z','a-a'-'a-z','a-s-a'-'a-s-z','c-0'-'c-9','c-s-0'-'c-s-9',\
'c-a-0'-'c-a-9','a-0'-'a-9','M-A'-'M-Z','M-0'-'M-9','S-M-A'-'S-M-Z','S-M-0'-'S-M-9','C-S- ',\
F1-F12,C_F1-C_F12,A_F1-A_F12,S_F1-S_F12,'c-a-s-a'-'c-a-s-z','c-a-s-0'-'s-m-9'()
*/
{