Sarva, thanks for your responses, which make very valid points about GM responsibilities and equal and fair treatment of players. i uphold the reasoning and would not want to see any GM inadvertently give PS a bad name.
so let me just add concerning GM duties that i have not known Tazen to be slow to attend to petitions, in-game help, technical problems and/or bug fixes - i see this when i am in game - and maybe i speak especially for the GMT +8 and surrounding time zones - unless i could catch Venalan on, i used to have to wait days for petition replies. if, in addition to fulfilling these first duties of a GM, a GM's role in player-run RPs does not extend beyond moderating and impersonating NPCs, then i take it there should be no objection to his taking part. dare i say it should be encouraged, if he is willing?
certainly it is ideal for RP if players fill all the roles needed in any RP, but maybe like me some of us have been in-game when there are only a handful of RPers on

or maybe like me some of us feel that RP could be just that much richer if the settings we're trying to play by - guards, octarchy, religions, for instance - could give us some 'play-back' too. to return to the original topic, i think Tazen tries to do some of this for the game, without bias. please don't penalise him for it; he is doing PS credit, just as the rest of you are by taking your roles seriously. we do appreciate it.