I can only tell you what I've seen going thru the Steam comments, but here's what I've collated in terms of bugs:
-"I like this mod but there's an apparent error in the Nezahualcoyotl XML file that causes the city name to display incorrectly. I have been unsuccessful in editing the file. (There's a space after the city name and before the " symbol that's not there in the other cities."
-"From time to time all your gold will be eliminated."
-Reports of the Hacienda textures glitching out (may just be due to using Dx9) or the Hacienda being missing entirely
In terms of E&D ideas, I think the two pretty defining options for his era would be La Reforma, which could maybe give one or two free Social Policies in return for a hefty gold sum, and the French Intervention, which might be a bit more tricky but could be very fun, switching the leaderhead to Emperor Maximilian with a big culture or science boost, but with increased unhappiness, and the option to change it back to Juarez afterwards to reflect the Franco-Mexican War. I've seen other mods change leaderheads before so it should be possible, but if its too complex let me know.