VPHOT now supports sloan u, g, r, i and z filters, in addition to the standard B, V, R and I. The code for the sloan filters are SU, SG, SR, SI and SZ.
This means that you can create and save sequences for any of these filters. VPHOT will automatically recognizes which filter has been used (assuming that the codes above are used in the FITS FILTER key), and apply the appropriate sequence for analysis and reporting.
Other filters can be added to the system as well. Let me know if you have any needs in that respect.