I'm building an R package myself for biocondutor, and if I want to use another package on bioconductor in my package, for the importFrom statement in roxygen, would @importFrom Packagename functionname be sufficient, or is there something else I need since the package is through bioconductor and not CRAN.

This type of question should be asked on the devel list bioc-devel@r-project.org instead of here. That said, here is the top part of the affycoretools.R file in my affycoretools package:

#' @importMethodsFrom affy hist mas5calls
#' @importMethodsFrom AnnotationDbi Term get dbconn select mapIds
#' @importMethodsFrom Biobase annotation exprs featureNames sampleNames write.exprs pData featureData<- AnnotatedDataFrame
#' @importFrom S4Vectors DataFrame
#' @importFrom affy AffyRNAdeg mas5 plotAffyRNAdeg plotDensity ReadAffy rma
#' @importFrom Biobase addVigs2WinMenu assayDataElement featureData ExpressionSet
#' @importFrom graphics layout legend par text
#' @importFrom grDevices dev.off rainbow recordPlot replayPlot
#' @importFrom stats median p.adjust prcomp
#' @importFrom utils write.table
#' @importFrom limma topTable vennCounts decideTests romer ids2indices vennDiagram
#' @importFrom edgeR cpm glmLRT glmQLFTest glmTreat topTags
#

Does that make sense?