Hi there.

1. I agree with you on that 100% in Medieval 2 Total war if I remember correctly (Although I've been playing Empire, Shogun and Napoleon for too long...) that you could field only a limited number of certain units, with scripting this could be substituted for this reason.

2. The Medieval 2 Total War engine does not have the features unfortunatley of retraining automatically if I recall correctly this was introduced only in Napoleon (one out of many reasons why it was superior to Empire, even though being smaller in scale) therefore I believe (unless I am incorrect and with heavy scripting it is possible) you can do it the old fashioned (and btw historically quite accurate way) of merging units. For example, you have two units that have had heavy losses in the last battle, you may merge the two, however the game accounts for the problems with merging by losing several experience ranks when merging a persay gold unit with a non experienced unit.

3. It is possible to create wonders in the form of buildings in the city roster, however I believe currently the EB2 team is working on the visual representation of already created wonders in ancient times (the Pyramids to name one), thus it is possible, however you will not burst out in a shriek of joy once you realise your Roman empire has control of nearly all the wonders of the ancient world.

- Diodredai