well i don't think there is any existing patch to disable your keyboard in FF7 but it can be done easily, i have made a small patch for youhttp://www.mediafire.com/?3sq982hz7njc5p8
the patch was made using DUP2, some virus scanners will detect it as a virus, it isn't a virus its a false positive, but if this still bothers you, you can use this patchhttp://www.mediafire.com/?4k86mda26yjv4y4
it does the same thing but was created with DLPB's Hexteditor (so your virus scanner won't go off), to use this patch put it in the same folder as FF7.exe and run the Hexteditor and it will patch FF7.exe
(also make sure if you are on vista or win7 or win8 to run as admin when patching)
or if you know what you are doing you could just get a hex editor and edit these address's
change each of the above address's to 90 and that will disable keyboard in FF7.
Also 1 more small note, this does disable the keyboard in FF7 but for some reason CTRL+Q still brings up the quit screen.
I hope this helps, let me know how you get on.