The "Awlpike" from Dragon Compendium p.110 has the following entry:
Built similarly to a longspear, the awl pike is almost 15 feet long. You can strike opponents 15 feet away with it, but you can't use it against foes closer than that. If you use a ready action to set an awl pike against a charge, you deal double damage on a successful hit against a charging character.
The feat "Shorten Grip" from Dragon Compendium p.108 grants the following benefit:
When wielding a pole arm with reach that you are proficient with, you may treat the weapon as if it did not have reach. The weapon is unwieldy when used in this fashion and you take a -2 penalty on attack rolls when attacking an opponent you normally could not.
The feat "Short Haft" from Player Handbook 2 p.82 grants the following benefit:
As a swift action, you can choose to lose the benefit of wielding any reach weapon other than a spiked chain or a whip. In return, you can use that weapon to threaten and attack spaces adjacent to you. With another swift action, you can give up this feat’s benefi t in order to regain the use of your weapon’s superior reach.
My question is: "Would any of these feats apply to the Awlpike in some way?"
I remember the feat "shorten grip" from Dragon Magazine #331 specifically stating that this feat cannot be applied on the Awlpike, yet although Dragon Compendium cites the same issue as the source of both the feat and the item, it does not exclude the Awlpike anymore.
As for "short haft" from PH2 there probably was no 3.5e precedent for a weapon with a reach of 15ft. save the whip, which has separate rules as a reach weapon and which has been excluded from the feat.
It seems to me that RAW there is nothing that would prohibit using one of these feats with an Awlpike, though it seems odd to me because RAW again you would be able to strike adjacent foes but not foes 10ft. away. As a DM I'd be tempted to either allow the player to shorten the Awlpike to a 10ft. reach but not to 5ft as the feat would normally allow - or exclude the Awlpike from being used with these feats altogether.