+1 There is genuinely no good reason why anyone would want to run from a form. Personally, I've talked to new players who accidentally fat finger run from a form, get depressed when they find out how rare a form is, and then quit. You can say they are weak willed, but the reality is: Most normal people, especially those who are playing a game for the first time, will simply make mistakes like that. Many will then quit because they have absolutely no incentive nor attachment to the game to continue. This is one of those situations that I think should really be clamped down on, especially since, like I said, there is no legitimate situation where a player would actually want to run from a form encounter.
Gameplay Positives: Helps prevent players (especially new ones) from getting frustrated and quitting.
Gameplay Cons: -
Easier said than done though; the point about macros etc might be a really good one. No idea how easy it is for the dev(s) to balance the two dilemmas with any single solution.