Approach Controller described a potential conflict event when convinced by a pilot request; changed the sequence out of a holding pattern and turns to final were wider than anticipated.

Narrative

Air Carrier X was holding at 3;000 FT and Aircraft Y was holding at 4;000 FT when the airport suddenly went above minimums. I vectored Aircraft Y to follow Air Carrier X who was on his procedure turn inbound [and] had asked for a close turn. Aircraft Y asked if he could get in front of Air Carrier X who was 8 miles outside the final approach fix on the approach. Aircraft Y asked for the close turn and I immediately turned him and descended him to get in front of Air Carrier X. His roll out was slightly longer than expected so I pulled Air Carrier X off the final for spacing. I cleared both aircraft again with speed restriction. Based on what I could see; I'm not completely sure I lost separation. However; when aircraft Y was on about a 1 mile final; he did slow down. I believe I did have separation the entire time. The Conflict Alert never did alarm. What I should have done was not force an unnecessary situation based on an aircraft request. We are a seasonal facility and this was the first heavy traffic day and I may not have been up to my capability to attempt such a maneuver. I also could have realized the situation was developing and given Air Carrier X a more drastic turn to accommodate the request. It was bad planning on my part.