You might try driving it off some additional options on the sales price list . Can service be a different facility or even a special sales rep code?   You have these files to pull fields from in the standard set up of the sales price list.    I was initially hoping you could drive it off the transaction type but that doesn't seem possible.     

   I heard a rumor that pricing might be an area being examined for a future upgrade.   Not sure where i got that. 

You might try driving it off some additional options on the sales price list . Can service be a different facility or even a special sales rep code?   You have these files to pull fields from in the standard set up of the sales price list.    I was initially hoping you could drive it off the transaction type but that doesn't seem possible.     

   I heard a rumor that pricing might be an area being examined for a future upgrade.   Not sure where i got that. 

Thanks Stephen and Martins. It seems that for some fields it doesn't work as expected and may need some (minor) script adjustments as also alluded to in this post.

So I dove into the SPRICLINK once more and found that the Payment Terms might be useful. It works as expected in tests and allows me to have a specific price list for the Service Request while not interfering with regular Sales Orders.

Thanks.   Can you mark as answered.