[Jmgr]

Not working in HL2DM, because DM uses 'Escape' style menus instead of 'Radio' menus. Any chance of updating this to work with HL2DM?

Hm. I don't have much free time now, but I will take a look at this problem as soon as possible. Anyway the plugin is free software so you can upgrade it yourself if you cannot wait :p

Does this only let people vote once or save the players vote so they cant vote in the same poll more than once and so it wont popup if they have voted before?

One player can only vote to a specific poll once. Like a real poll ;)
To say it otherwise, I store the couple steamId/pollId as primary keys in a table.