scenario design help?

[Siddhi]

a couple of questions to help me with a scenario i have been working on for the last couple of monthes.

- new 3.0 patch
i started the scenario construction in an earlier version and have not yet dl`d the new patch. can i install it and continue the scenario design, or alternatively finish it in the present version and still play it in 3.0?

- increasing infantry fire
the present effects of one type of infantry i am using i consider to be too low, partially because the grenade launcher used by the AI (which the player side does not have in its units) seems to unbalance it a bit. secondly i also consider the different rifle effects to be important. i do NOT want to mobhack and give the rifle of the players side a "scoped" rating, also i do not want to raise experience of the unit too much as it unbalances gameplay. i have tried the following
- add a "fire control" rating to the infantry unit (does not seem to have any effect, correct?)
- increase "infantry toughness" to the players side (to decrease the effect of the enemy gernade launcher)
- decrease "infantry toughness" to the enemy (to raise the effects of the players rifle squads)
unfortunatly the last option increases the effect of ALL hits on the squad, while i am only looking to raise the infantry vs infantry rating. also, in the second option raising the toughness makes the unit "too tough" facing armour and arty (arty effectivness is also being slightly reduced as it is)

finally, what would be a "true" representation for a unit only armed with rifles? the rifle only in slot 1, or the rifle in slot 1 AND in slot 2? IIRC this was orignally done in ye old original SP game.

suggestions?