Been thru this....not an expert but answers based on various advice I was given at the time, will stand to be corrected by one of the several experts out there!. We kept the house and have it rented (probably should have sold....hindsight & 20/20 vision.) How ever :
1) we did transfer it to each of our names and it didn't cost too much. Didn;t have any stamp duty bill. The solicitor charged something like €1000 or so. However if one of the siblings wants to be bought out then the stamp duty will apply.
2) Time limit...as far as I know there is no time limit once you all agree. My understanding is that the price used for probate (€700k which should have been a true reflection of market value) will be used as the starting point for CGT (though you might be looking at a capital loss!).
3) not sure, but I don;t think the "estate" can enter into a contract with the tenant, but the executor might be able to if everyone agrees, still think it's better to have it in everyones name as you never know what could happen down the road (family arguements, someone dies, etc)
4) on that last point, make sure you all agree with exactly what you are doing and agree who's going to be doing all the work. I wanted to pay someone (even one of us) to look after everything, but shot down :"sure we'll all do our bit". Now most do nothing and some do everything.
5) I don't think the estate can be liable for tax once probate is granted as all the tax affairs should be in order at that point.