Pathfinder has a feat called Furious Focus that negates the penalty imposed by Power Attack when using a two-handed weapon, but only on a characters first attack in a round. Currently, we can't correctly show the Power Attack temporary bonus for characters with this feat.
I propse an extension of the BONUS:COMBAT|TOHIT as follows:
BONUS:COMBAT|TOHIT-FIRST|x - the bonus is added only for the first attack when a full attack is displayed
Note that in case a Haste temporary bonus is applied, the bonus does not apply to the attack granted by the Haste effect, only to the first, main attack.
Moot by new Formula Parser and the fact the JEP Bonus system is now deprecated.