Question on RS Plans

Hi all, we have a benefit plan that allows employee's to have money taken out of there checks which is then sent through a 3rd party to purchase McDonald's stock.  We currently have this set up as an "SP" plan type because it fit somewhat close however this is not a direct stock purchase plan.  We would like to make this plan available to add/change during life events, however because this plan requires cycles be calculated there is built in logic in Lawson that only allows mid-year changes to plan types of RS.  My question is does anyone have any suggestions for a work around for this?  EIther a config or customization?  Also does anyone forsee a problem with us changing this to an RS plan type?  Is there some sort of tax implication for making that change?