There's a problem with AI (version 0.7.7). Clearly it doesn't know how to develop after middle age. It managed, due to a decent gold harvest get some good techs and buy units at good rate, but cities stayed at size 5, when mine were at reasonable 17. Difficulty was regent though.
I haven't tried such people-sensitive government type like democracy, but in federation having war with everyone for like 500 years didn't seem to bother citizens at all. Maybe because of abundancy of wonders?
The idea of having land mines seems to be great idea. Even though a few mines I had were virtually avoided by the enemy, it is good that they spent time avoiding them. I decided not to place more, because was afraid mines are accountable in the army budget (?).
There were no means of transporting trucks (I guess they are good land carries for some units) to colonies overseas. Looks like a transport doen't fit in another transport. I think it would create a dangerous loop of some kind.
Air transportation (by airport) didn't work.
Caravans were unclear. I remember, although vaguelly building caravans years ago in civ 2. This time, since no help was provided I didn't build any. Gold didn't seem a problem though. I also suspect AI didn't know how to use them.
Absence of entires in civilopediae seems one point where least work required compared to the beneficial effects.
Another good point was increased cost of units.
It is really boring to move some 40 atrillery pieces and 20 tanks at deity in regular civ 3, given absence of advanced interface support. Here some 5 panzers, given their ability to bombard (a controversial issue. It eliminates the need for artillery. Something should be done to make artillery more useful. Maybe making subtle distinction between firing at units and sieging cities. Also autodefending against attacks) can easily take a middle size city.
Introduction of full-capable air transport was also a bright idea.
Increased movement rate for air units is controvercial, since it decreases strategic moment, which means no planing of units in advance is necessary. It took a nerve sometimes in a normal situation to decide where to concentrate air units in situation of several fronts, because they could only be used after enemy makes a turn (same whith artillery, except they were changed to lesser degree). This needs to be thought of. Maybe changing it by allowing extra movement when moving between airports (or airbases?), which would then serve as infrastructure?
engineers are funny
Making communism stronger by getting more shields per pop rush (which makes since. Rushing nuclear plant guys will give more than rushing mill workers. Duh!) Is there a way to make pop rushing stronger because gold is so easy to get? DyP is such an immense mod I doubt if we really will finish balancing it. 
it shows up fine in my build-list. Of course I'm not running 0.77 at the moment, but we haven't consciously fixed this to the best of my knowledge, so i assume it should show up in 0.77 too. It is true however that some buildings do not show up in the Build Button (not the list), but check the Known Bugs list on the DyP site for details on that.
