Ideas for RoomKeyPMS

We are a boutique Inn and do a great deal of concierge transactions for our guests prior to them checking-in (e.g. groceries, car rentals/service, flowers, etc.). We use the company's credit card and then have to wait until the guests check-in in order to post the charges to their reservation; sometimes we do this months/weeks in advance which becomes problematic due to the lapse of time for when we do the service to when the guest checks-in. We also use your system to charge an "event fee" for when we have weddings on property. The only transaction code we can apply to collect the payment is the "room charge" but that charges the client our service fee, resort fee and taxes. We then have to wait to check the room inn, reverse the trancode and use our "Event fee" transcode; always leaving a balance which we either have to reimburse or apply the money elsewhere. We could avoid missing these transactions or posting the incorrect amounts if we were able to just post charges to the reservation where they have checked-in or not.