Question about efficient armor and direct fire

[RLW]

I ended up making up my own house rule in regard to this. I allow efficient AFVs to take two AT or DF shots but that they can only take one at a time and then place a one shot fired marker on them. In subsequent impulses they can fire DF a second time and combine with whomever is in that stack and such. In the game I am playing they seldom got the chance to do so in that Fog of war roles tended to end the turn before they ever got around to firing hat second DF shot. BTW, I use the same rule for move and fire where the units move or fires on one impulse and the gets a n first shot fired ,marker and the gets to fire or move in a subsequent impulse and can combine fiore just as if it were firing normally (only it suffers the -1 penalty fpr having moves and fired. These house rules seemed to work pretty well.