A couple things. First, I cleared out the first three segments, and second, I didn't bother with most of the lake battle. Basically, I jumped straight to the Barcon. If you want to see any such AVI's, just tell me.
Here's the run up to Barcon destroyed: http://dehacked.2y.net/microstorage.php/info/833/Mega%20Man%2064%20%28USA%29.m64 Savestates: http://rapidshare.de/files/13683134/savestatesmm64.zip.html Remember to run it with raw data enabled (my fault). I took a different route in the Cardon Sub-Gate which prevents having to revisit the conveyor belt room. The jump to the high platform was done differently as compared to the .avi (I went back to change it). Finally, it was hard to hit the Barcon's arms; it would have been better if there was no shot tracking. :( The run is 27 minutes long, but game time is 23 minutes. This is due to (unavoidable) lag. The .avi won't come yet. The savefile file servers are full.
Although my run has not finished the Barcon yet, I went ahead (without recording a run) and tried out the Main Gate glitch. Although I was able to get into Main Gate early, I ran into the same problems that you guys ran into as well. What I would like to know is why there is such a "hole" in the ruins that allows me to simply fall out of the map using the Jet Skates. Are there any such similar holes anywhere else? If it is possible to fall out of the map in the Main Gate area, it would be trivial to get past the problem door.
From watching your run, I'll decide whether to get the Old Hoverjets and make the Jet Skates first, or get the red refractor first. At least, I'll try out the Main Gate glitch to see how it works. Note that I have never played up to that point yet.
Yes, if by Power Raiser you mean Laser. :)
On the order of sequence breaking, not really. But you can get the Rollerboard and 9260 zenny, then leave through Portal 2 and call Roll.
Speaking of Sniper Unit, I somehow realized that at the lowest range level, it is impossible to knock out the Barcon's back cannons. Seems unfortunate, since I wanted to destroy the Barcon with max attack (Laser+Power Raiser Omega).
By the way, is it possible to glitch into Main Gate without using Jet Skates?
I like to glitch up games, too. I found a way to enter the ruins from Cardon Sub-Gate without Jump Springs. It seems near impossible in real-time, though: http://www.savefile.com/files/3668560 To make it to the high platform, a perfect diagonal jump off the elevator panel is required.
I've been watching the SDA run of Mega Man Legends and I can't figure out why he gets the Cannon Kit in the run. It takes a lot of time to get and he doesn't use it a lot. I also think he picks up too much Zenny.