Hallo again,
in the past years I have let characters with the lucky background add 5 to maneuvers, initiative, attacks, RRs and criticals, while I let characters affected by the inspirations spells add the relative bonus to all of the above, minus the criticals, as I thought it would have been simply ridiculous; though, as of late, as I am having another campaign, I was pondering about having the inspirations spells not affecting resistance rolls either (or maybe not affecting just RRs that are not modified by a BAR). At level 17 a paladin can instantly add 40 to every roll of all of his/her allies that are in the range of 170 feet from him/her (for a duration of 34 rounds, which usually is enough to cover the whole fight), even checking arcane spell lists there are really few spells that can be compared to such power as for buff/defense effects (well, offense too, actually).
I wouldn't mind your opinions and/or official clarifications, and thanks to the ones who promptly answered already.