I would like to propose adding rowspan support to the dokuwiki codebase. Support could be based off the modifications suggested in the following page:
I make this suggestion for serveral reasons:
1. A plugin adding this support would be very difficult to make:
a. The plugin would (most likely) have to completely replace the table system with a new table system at a lower sort order.
b. Tables are very difficult to replicate in a syntax plugin due to the lack of the ability to use AddCall.
2. Since no plugin exists, the modifications must be made directly to the source. This is becomes a maintenance nightmare when upgrading to newer versions of dokuwiki.
3. The proposed syntax modifications do not break existing wiki syntax, except for current colspan syntax. Unbreaking colspan syntax would be a fairly trivial modification.
Thanks for your consideration!