Thanks for the suggestion lanux128, but it makes a global ctrl-o that overrides all ctrl-o's in any app.  I should have been more clear.  I'd like to trigger farr, and then with the cursor inside the farr command window, be able to hotkey to the options page.

I use alt-j to trigger farr, and still can't burn it out of my skull: alt-j, alt-o.

I have fcalc 1.11.01 and in the config box under "Regular Expression (custom override)" I have:

^=(.*)$|^=$|^fc (.*)$|^fc$

... which brings up fcalc when I type '=' into farr.  So far so good.

But after I do a calculation, say '=1+2' and hit enter, it shows the expression and the result in the window below and it replaces the command line with 'fc ' and at the bottom of the window it says 'FCalc plugin by mouser'.  But it doesn't respond to further typing.  For example, 'fc 3*4' does not show 12.  Although it does still say 'Fcalc plugin by mouser' at the bottom.  If I remove the space 'fc3' it switches back to a farr search and shows me anything that matches fc3.

Would love to type '=1+2' and get '3', and then continue typing '3*4' and get '12'.

In the "Regular Expression match (default)" box I have:

^fc (.*)$|^fc$

Thanks for any suggestions.