In my current PBEMs I've noticed that the build area for French depot btns seems very limited (latest beta patch, both regular and grenadier). This makes it impossible to build all the possible depot btns for France, which makes reinforcement quite a bit more difficult.
Is it WAD that they can only be build in the Paris region? I believe that in previous patches they were buildable in Strasbourg & Colmar too (like most other French units).