In a account dialog it is possible to delete a local resource like local mail folder but it isn't possible to create a new local resource. E.g. I did remove the local calendar resource accidentally and couldn't recreate it. version 4:4.5~20100910.1175286-1maemo5.1174786
Indeed, the new account wizard offers only Kolab.
After deleting a local calendar resource it's not possible to generate a task/event on a kolab server too
Still valid in 4:4.6~20101210.1205185-1maemo1.1204898. It's possible to remove the personal calender and not to add a new one via flap -> account
Both, local calendar and local contacts resource provide a wizard now which shows up in the account wizard.
Verified on WinCE