Petty Cash
If a character wants to grab some random "walking around" money before leaving the ship he can roll D100 per 10 points of Profit Limit, to represent what is readily available for small expenses. If the character forgets to do this before she leaves the ship, she will still have D10 per 10 points of Profit Limit in "loose change" somewhere about her person.
Organizational Influence
While an Inquisitor might have a Profit Limit equivalent to a Rogue Trader, her Acolytes rarely do. That being said, they often have a surprising amount of influence within their respective organizations. Within the power structure that they are used to working within, an Acolyte would be expected to have as much or more power than a free agent such as a Rogue Trader. To represent this, whenever operating within the power structure of their career they have an effective Profit Limit of the total of their Career level, while within the Empire in general they have an effective Profit Limit equal to their current Career level. For example, Imperial Guard Lieutenant Smith (Career level X) would have an effective Profit Limit of XX within the Imperial Guard and an effective Profit Limit of X wth the universe in general. The Inquisitor can always lend part of his own authority, represented by a portion of his Profit Limit, in the physical form of a Writ or Rosetta and in game terms by a bonus of +10-30 points of Profit Limit.
Hope that helps some for calculating petty cash.