I don't know about a published list, but your SG could come up with some general guidelines. In my troupe we've had several wizards pursue "unattainable" goals only to find them...still unattainable, but a heckuva lot of fun trying. We actually drew up a skeleton of a process, simply requiring a magus to spend seasons "researching" the issue. Every season they worked on it they made an appropriate Lab Roll and recorded their total. I recommend making them do this for years or decades...breakthroughs shouldn't happen easily or quickly. Maybe the SG should dole out tidbits, juicy hints of possibilities, at various benchmarks.
This is the house rule we developed (it's very rough, mind you, invented to aid a player researching something like your wife). Feel free to use it or ignore it:
[b]A magus may research a new understanding or application of magic, including attempts to circumvent known laws of magic. Every month spent in the lab with any necessary materials (as determined by the troupe) results
A lab roll is made with the appropriate arts. A target number is assigned by the troupe, only revealed to the magus after the first month is spent. This target number should be derived by considering years of work relative to the difficulty. There is no margin involved.
For example: Tampering with an Aegis to acheive the ability to jack it with vis after its been cast. The troupe decides that it might take a magus of fair Rego Vim mastery and moderate advancement (LT: 40+d) 2-3 years of successful research along a single line of inquiry. So 1200 research points for 2.5 years.
Storyguides may feel free to introduce artifacts or knowledge that can give the magus points toward the accumulated total.
If you ever botch your lab roll, the troupe may decide to dock you some accumulated points, or raise your target number, or some other calamity.
The research need not be done all at once.
Every month you must also roll on the Research table:
Simple Roll Result
1 Complete Failure: the line of inquiry you've been pursuing leads to a dead-end. Any accumulated margin is forfeit. You may,
however, restart your work from a new perspective.
2-3 Lose month: Inadequate lab equipment. Unforeseen delays. No lab total for the month. Pick up where you left off.
4-6 Complications: Distractions, unforeseen problems arise. Divide your lab total in half.
7-8 Slow Progress: Calculate lab total as normal.
9 Extraordinary Success:
10 Discovery: calculate lab total for the month, then double the accumulated margin.[/b]
http://www.orderofhermes.com/files/House_Rules_2009.htm
Good luck! Hope you get some good ideas.