One small request..

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Short answer: No. We cannot change this, at all, ever.

Long, boring answer that involves modding info: RTW hardcoding limits the number of building complexes to 64. The RTW 1.5 patch completely hosed the way EB was handling recruitment, so we had to move to a new system. The only way we were able to keep something similar to the old system was to split things into factional and regional barracks. However, we already had over 40 building complexes at the time.

The only way we could maintain recruitment within the building complex limit was to double-up the factional and regional barracks. Regional barracks made sense - they were intended to be culturally based from the beginning and you have at least one turn of repairing a damaged barracks before you can recruit troops.

Factional barracks were a bit stickier and required us to look long and hard at the various factions. We worked with the FCs to determine the feasibility of recruitment and troop training after conquest. Factions deemed to have similar training ethos and training/recruitment facilities were stuck together. In some cases the marriage is perfect (Aedui/Arverni), in others it isn't exactly perfect but good enough for the restrictions (KH/Epeiros).

In all cases the barracks are damaged by script upon conquest, requiring a turn (ie three months) to pass before you can recruit troops. Also you should really be destroying your government and building up a new government before you repair a factional barracks that can be used by your faction, which is the "correct" way to portray it - those players who do otherwise are free to do so, but it is considered an exploit.

The reason why I said "no, never" at the beginning is that we are currently at either 63 or 64 building complexes. For many reasons this will no longer be an issue in EB2, but for EB1 we're stuck with what the system provides.