I am not sure this could be done while actually saving you work. Since file names can contain numbers, we need to use numbers to filter the list of files. So the line number would have to be in a separate edit control in the dialog, which you would need to move into before typing the line number, which does not really save you any key presses.
Thanks for replying feline :) Like you said it would be more useful when it's in one same dialog box. Can we do something like appending ":" before inputting number?
i.e. Shift+Alt+O "filename :50"
It will just list out the files the same way, but when hit enter it goes to line 50 instead of line 1 of the selected.