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Runes are an important resource for training. Especially when using Evan's Link Skill, runes increase exp gain significantly.
Assuming a character is continuously training in a map, a rune will spawn as soon as their personal cooldown for using runes (usually 15 minutes) ends.
However, what if there are two people partying or sharing a map?
The rune's exp-buffing effects, as well as character buffs (such as speed, skill cooldown reduction, or damage boost), only affect the character who activated the rune. And runes still only spawn once in 15 minutes.
So, people who wish to party up are penalized by the game, because they have to split the runes between party members, and lose out on the significant exp buffs they grant.
My suggestion is to make runes spawn faster when there's a party in the map (proportional to the number of people in the party: every 7.5 minutes if 2, 5 minutes if 3, etc).
Note that the personal cooldown doesn't change, so people could not just bring a mule to the map and then activate double the runes on their main.