Using <[nowiki] [nowiki]> to escape from wiki2beamer is cumbersome. Instead using %% in front of a single line could do the same. Where wiki2beamer would just remove the %% and pass the rest of the line through to latex. Using %%% would allow for completely untouched latex comments. At the moment wiki2beamer doesn't handle % and expands whatever is after the comment. This could stay that way.