An offline version.... You would have to buy the equipment.

http://www.ymimports.com/collections/go-game-sets

 [and dang they raised the prices since I last bought from here]

Play more often.

I occasionally Like to spend 10-15 minutes thinking something out. [then again I also like to play in amateur tournaments.

What I meant was, the 5 minute move timer in the upper right. [main time can keep ticking] 

I see no need for this when there is also a clock next to their name. 5 minutes a move isn't something we should have for go.

This should help you. 

http://playgo.to/iwtg/en/

.... Honestly, I don't know how to respond to someone like you, regardless how long its lit up. If they pay attention, they can tell what you're doing.