There's nothing "quick" about having to register three unique IDs to play the Metal Gear Online beta. But, assuming most would-be participants have already got a PlayStation Network account, the real pre-game obstacle has been the Konami ID and its supplementary Game ID.
Since the beta (with its laggard update patch) was released for download last Wednesday, the Konami ID registration site has been a case study in how not to prepare for a traffic spike. Thankfully, the site is now back online with a temporary "quick registration" option for those of you eager to push past the bureaucracies and land in some actual gameplay, um, rather, return to the waiting room...