Lanefan
Victoria Rules
Given how rarely it'd likely come up, and how even-more-rarely the same situation or environment would repeat, I probably wouldn't 'write' anything and instead just wing it were someone to try something like this without a feat.How so?
Would you write it so you had a penalty on the jump check? Wouldn't that reduce the overall odds of success and thus negate the bonus conferred by using the pole in the first place?
Or would it be a check to use it, which then conferred a bonus?
Or a DM winging it.A *good* feature does that. And not every feature is necessarily well written. When you have a deadline for putting out 75 feats, sometimes you just need to meet the quota.
But then that makes you wonder what the penalty is for trying it without the feat. So that typically adds codification and a rule that needs to be looked up...
Think about it - how many times in your DMing career has a character ever tried an improvised pole vault? I'll wager it's far from often enough to be worth writing a rule about...so for things like this, just wing it.

Lan-"in my case, unless my memory fails me the total number of improvised pole-vault attempts in the games I've DMed is zero...or maybe one"-efan