Really? ... gonna have to check my posts again. I was trying to be good about reporting what worked (provided I found something that did actually work at least - there were at least one or two things that I haven't actually resolved, but got pushed to the back burner like mom's video adapter on the ibook - but she doesn't seem to mind looking at the little screen, so I'm not in a rush on that atm. I did get her some cheap RAM that fixed her sluggishness though. Seems the last system update took up a great deal more resources and she just didn't have enough oomph so everything was constantly hanging. She was ready to buy a new one just to read her damn email - I fixed it for under 30 bucks instead.)
As far as this goes, the new same model mouse hasn't had the issue, so I suspect that it was indeed the cord because that would also possibly explain the weird freezing/sticking problem when using the ps2 adapter as well. Considering that it hasn't had an issue since posting the previous update and it was doing it at least once a day to upwards of 3 times a day before the switch. I'm not sure if the cord I intend to replace it with is entirely sound though so a new test run with the original might be premature.
What else did I forget to report back on?