Feat: Open Spell Slot

[chinagreenelvis]

Looking for a way to provide a small measure of emergency versatility for prepared spellcasters, both in and out of combat. A problem I'm having playing a druid is that infrequently, extremely specific circumstances arise in which a particular spell might either come in handy or lend itself to a creative way of solving an immediate problem. The spell in question is almost always one that I haven't prepared, and I can't afford to make scrolls for every single spell that I have access to.

Here's what I'm thinking:

...

Open Spell Slot

Once per day, you can spontaneously cast a single spell.

Prerequisites: ?

Benefit: When preparing spells, leave one spell slot open at your highest level. As a full-round action, that slot can be filled with any spell you have access to of the same level or lower.

[Aralicia]

Hello

You could use something like this :
http://www.d20pfsrd.com/feats/general-feats/planned-spontaneity

or that :
http://www.d20pfsrd.com/feats/general-feats/versatile-spontaneity

That's not really a new concept, and this kind of feats appeared here and there since 3.0

[Cap. Darling]

Can't you just leave a slot open and then spend 15 minutes Preparing it when the need is there? Or is that only wizards and clerics?

[CalethosVB]

Prepared casters can already leave spell slots open, but to fill those later takes at least 15 minutes per 1/4 of your spells to prepare.

If you have 20 spell slots available to you at the start of the day and decide to only fill 5 of them, you can spend 15 minutes doing so. However, if you wish to prepare only 6,you must spend at least a half hour preparing your spells. This works the same for divine and arcane spell casters.

And as pointed out upthread, there are feats for this.