I've seen this topic pop up on occasion, and I wanted to get some feedback on a possible house rule. One of my biggest issues with this game (mechanically speaking) is the imbalance that exists between Sanity and Stamina. On paper, they seem well balanced. You lose sanity first, but only once, while stamina is secondary but can be hit multiple times.
In practice, though, you soon see that Sanity is much more precious than Stamina is, for multiple reasons (it's also obvious if you compare Vincent and Caroline - the latter is one of the best characters and the former is one of the worst):
1. It's used for spellcasting, so it functions as an independent resource in addition to being a combat statistic (a resource that is drained very quickly no less)
2. Unlike combat checks, there are few things that can affect a horror roll, meaning that it's harder to "shore" up a weakness and consequently horror checks on average are harder to pass than combat checks are, particularly when you have a choice of when and what you are fighting, which is usually the case .
3. It is often in more danger of being lost than Stamina, precisely because it only gets hit once - most people won't enter combat with a monster they do not have a high chance of killing because they will die if they can't, while it's easy to justify shrugging off sanity damage to fight a monster you have a good chance of out-combating.
Due to the combination of the above, Sanity comes out far ahead in the valuable commodity chart, and I've been thinking of house-rules that would both make sense and help bring better balance (and give those high stamina investigators a boon over the high sanity investigators, who tend to outstrip them in general performance).
What do you think about letting investigators sacrifice stamina for movement points on a 1 for 1 basis? To me it makes perfect sense (representing furious flight toward your destination), and it seems pretty balanced - it would only be worth doing from time to time in specific circumstances, and only high stamina characters would be able to do it often, and they tend to be weaker anyway. In particular, it would give a pretty terrific boost to Vincent to make him playable. I would probably allow a maximum of 2 stamina for 2 extra movement.