Change the keymap to search the history in the Find in Path modal

Hello,

I use Rubymine under OSX.

I have assigned the key shortcut ⎇ + ↓ (alt + down) at the operating system to toss windows around.

Therefore I need to reassign the keymapping in rubymine.

In particular I want to remap the "Search in history" while doing Find / Replace.

However it seems to me that this particular keymap can't be edited:

Is there any way to work around this?