In our play group we updated some marginal rules, playing sometimes very big scearios, battles of 6 or more turns and campaign. Buy in play we changed two Golden rules, and i assure you we playtested for years with success.
GOLDEN 1
Activation limit 1st action during a turn
The players, as the first action of the turn , can not keep the initiative. From the second activation is possible to keep it
as normal. That is, 1 per faction’ action as the first turn’s action, in order to decrease the initiative roll impact. In fact,
this rule limits the impact of the initiative on the turn, giving more depth to the global tactics.
GOLDEN 2
Support fire in engagements limit
Each formation can give its support fire only once per turn.
In case of a tie of the engagement’s result , the “second round” of the engagement will be done only by the involved
formations. Who gave support in this engage will not give a second during the same turn. Mark this aspect for each
formations. This rule represent that formation can only help another formation during the turn, limiting and giving a
realistic aspect at the support fire. A detachment can use his F/F only once, when activated, and support infinite engage?
We see this unrealistic.
There are more House rules about stronghold, siege scenarios, AA limit, destroying buildings, heavy space ships in Battle, etc...
Here the full House rules compendium
http://www.caputofrancesco.com/eatotalwar/EATOTALWAR_compendium_v1.0.pdf