it would make speech a little more useful if other such skill checks in dialogues could optionally be passed by one with a high enough speech skill. in the example above, there could be an additional conversation option for the player using his speech skill instead of explosives, with the same result. speech skill equivalent to the original skill requirement seems fair. so, since pete requires you to have explosives skill of 25 (?) before giving you dynamite, you'd also need a speech of (25) to convince him that you know how to handle explosives.
same goes for conversation options with attribute checks instead of skill checks. im not far enough into the game to know how often this might come up but even a few more uses for the speech skill would be worth it.
of course, if this has already been done, id appreciate someone pointing me in the right direction