Steal from minimus and social network analysis
One of the relationship models I like the best is from Minimus. Where the player is instructed to denote a directed graph with blue and red arrows to indicate like and dislike. Every node of this graph is another person who "each person can do some-
thing useful that your character can’t; they’ll ask for something in
return." By indicating the from of the relationship and the utility of the relationship in the graph, a very simple social network can be depicted. As players play, changes in the relationship map (page 4) represent real character development.
To adopt this for a longer game, keep the same map principle and continue drawing in pen. By indicating additional likes and dislikes (also accompanied by a want/need descriptor and potentially in a subgraph if things are too fiddly) you can see easily the predominant attitude of an NPC towards anyone else (is it mostly blue? Is it mostly red? Is it thick? Is it thin?) and the historical trends of their relationship. Social Network graphs are also quite flashy. For extra credit, place nodes on index cards and connect them by yarn pinned on the wall. (One of my favourite diagramming techniques). If you play in a place that provides this, the relationship map on the wall will be a constant reminder of the game during the game session and will make relationships (and their manipulations) obvious. The ritual of adding more yarn to the wall is a tangible and real reward (or punishment) that is easily linked to feelings of real satisfaction.
In terms of linking to diplomacy checks, I would first use an alternate diplomacy system. To produce the least impact on the game, I'd borrow The Giant's alternate diplomacy rules and assign modifiers based on the graph. The count of blue to red indicates a point on intimate/nemesis and maps directly to that bonus. Risk v. reward is a case by case, with the want/need of a specific relationship providing a bonus if invoked.
This method, especially if constructed in a persistent index card/yarn mode, provides a visceral and tangible graph of relationships in the game that acts as a focal point and means of tangible reward for characters, while keeping things simple and easily searchable. A digital version of this map can be trivially made with graphviz. Beyond graphviz, I'd recommend yEd or an online flowchart tool of your choice. If you're willing to do a bit more work, the graphviz extension for mediawiki should produce excellent results. If you want a prettier layout, I recommend Illustrator or equivalent vector graphics program.
Best Answer
No.
It specifically states in the prestidigitation spell:
So within the Rules as written for the Prestidigitation spell, no. It is unable to ignite tobacco. The spell you're looking for is Spark.
Spark states: