Typically, I would say YES. In theory, you can use the RetroPie menu system to do updates. The only problem is with the joystick driver, and there is a fairly simple way to update that (after you update everything else).
However, with this latest RetroPie 4.4 update, I have heard that a lot of people "break" their installs when updating. RetroPie seems to recommend that you do a fresh install. Of course, then, you'd need to move/copy all your stuff from the old SD to the new SD. I think it can be a hassle.
If all you wanted was the additional button support, you could get/install that from GitHub.
From memory, it would go something like this
cd /home/pi/Freeplay/
mv mk_arcade_joystick_rpi mk_arcade_joystick_rpi_OLD
git clone https://github.com/TheFlav/mk_arcade_joystick_rpi.git
cd mk_arcade_joystick_rpi
chmod a+x ./install.sh
./install.sh
After that, you could 'nano /etc/modprobe.d/mk_arcade_joystick.conf' and edit it accordingly (and reboot for it to take effect).
However, with this latest RetroPie 4.4 update, I have heard that a lot of people "break" their installs when updating. RetroPie seems to recommend that you do a fresh install. Of course, then, you'd need to move/copy all your stuff from the old SD to the new SD. I think it can be a hassle.
If all you wanted was the additional button support, you could get/install that from GitHub.
From memory, it would go something like this
cd /home/pi/Freeplay/
mv mk_arcade_joystick_rpi mk_arcade_joystick_rpi_OLD
git clone https://github.com/TheFlav/mk_arcade_joystick_rpi.git
cd mk_arcade_joystick_rpi
chmod a+x ./install.sh
./install.sh
After that, you could 'nano /etc/modprobe.d/mk_arcade_joystick.conf' and edit it accordingly (and reboot for it to take effect).
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Neo Geo Pocket Flash Cart and Linker Project ( http://www.flashmasta.com/ )
Avatar art thanks to Trev-Mun ( http://trevmun.deviantart.com/ )