A short distance on the raw water side isn't a huge factor unless you are going quite a ways horizontally or up several floors vertically. If you think it may cause a pressure drop due to friction loss or headloss in the tubing you can always step up from the 1/4" tubing to 3/8". Tubing is cheap and the increase in inside diameter will really cut down on headloss meaning the membrane will perform better.
If you must run a long waste line be sure to check your final waste ratio once everything is in place then adjust the waste with a capillary tube type flow restrictor you can trim with a razor blade to adjust the flow.