Hi,
Yes, you can copy over the jos_sefurls table - I'm just not sure about your j25_urls, JoomSEF 4 doesn't use the _urls table, it also uses the _sefurls, so it should be j25_sefurls (assuming your Joomla 2.5 uses the j25_ prefix).
However some Joomla 2.5 components may use different URLs structure than in Joomla 1.5 which may cause unexpected problems. There may also be problems if your articles or categories have different IDs in Joomla 2.5 than they had in Joomla 1.5.
You can't just copy over the settings for extensions - in Joomla 2.5 the extensions configuration is stored in Joomla's _extensions table in the params column. Unfortunately the syntax of stored parameters is different between Joomla 1.5 and 2.5, so you can't just copy them - you'll need to manually set the parameters again in Joomla 2.5. Latest version of JoomSEF 4 creates the _sefexts table only for backwards compatibility, but it usually stays empty.
We've never encountered the problem you describe with Update URLs function, it seems like there's some problem with the AJAX call.
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