Im studying psychology and our PhD wants us to work with SPSS for the exams... BUT explained us all Analyses also in r (was not to learn for the exams but I liked it XD )
But i imagined sometimes the possibility of integrating basic analysing features into limesurvey - it would be great for small surveys. No need to buy expensive software or to do difficult vb programming with excel. Later one could add more features like Regression Analysis, Frequency Analyses or even ANOVAS: like this: select your independent and dependant vars or factors and click on next to analyse your limesurvey dataset..etc.. would be cutting edge for free survey software! (i dream of 'guided analyses' -> explanations, step by step help in selection of the appropriate math/stat. methods)
(@ university we use unipark/globalpark services. it gives us a dataset. for analyses we use r or spss)
of course there are other ways for this project, but as you said: r would be a 'bonus' the starting point for further implementation and scientific use
Its wonderful to use. like: import the dataset, csv for example, few lines to describe what to do and baaaam the same output like Spss, with plots and charts (Spss costs very much and r is free

)
Ps: just saw that the R-Project is also taking part in GSOC.
I'm going to look up under which environments it runs.. there exist a few descriptions how to use it from php. different ways, different systems. Im going to post the links here...