A: The emulator does not include any games in itself. If you own an existing game, you may want to obtain a copy of that game by searching the web.
Maybe you can find some public domain (freeware) games from these sites:
1.http://romhustler.net/roms/nes
2.http://www.freeroms.com/nes_roms_A.htm
A: You can change the VKeyPad in game Settings.
A: Theoretically, yes. But the Android browser is proved to have problem downloading games from certain sites. So the recommended way would be to download on the computer, and then copy to the SD Card. To copy games to the SD Card:
A: Yes. The emulator can properly handle zipped ROMs.
A: .7z ROMs are simply not supported by the emulator. You have to extract the actual ROM files from it before you can play them on the emulator.
A: It requires the multi-touch API support that is available only on Android 2.0 and later. And of course, you must have a multi-touch capable screen!