LOL
Sorry for that really rough sketch and the many typo's...didn't have much time when I wrote it.
To be slightly more precise: You can add the code for two upgrades in upgrade.ini and the two buttons that come along with them.
In the upgrade.ini, you should be able to add "ConflictsWith = [insert other upgrade name]" to the upgrade code to ensure that once you purchase the first science, the 2nd will be greyed out. Something like that should work...perhaps even for the sciences as well. I seem to vaguely remember that sciences can also include this part, but I'm not 100% sure. I suggest you try something along those lines if you haven't already...
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