The main limiting factor for the AR6100 is the range that it offers, it should not have have a problem with running normal servos (i.e. not high powered digital coreless servos such as the HiTec 5955 or JR8711) . I would be very careful if you are only looking at the AR6100 on a cost basis and trying to use it in a glow powered aircraft, and I would recommend that you rather look at the AR6200 (It only weighs 10 grams with it's satellite receiver and only cost fractionally more than the AR6100).

I do not know the actual power rating for the AR6100 as this is not commonly quoted due to the fact that it is not aimed at a market that would have high current draw, but for reference the AR9000 is rated at 30Amps. The limiting factor for current is not normally the receiver, but the receiver plugs. The standard JR/Futaba plug is only rated at 3 Amps, that is why people that decide not to use power distribution systems (such as SmartFly equalizer or a Powerbox) in large scale aircraft will always use multiple power inputs into the receiver. It is this large draw through these plugs that cause voltage drop and the associated problems. (This is why Spektrum have now introduced the AR9100 to try and overcome this problem)

Cheers
Pupmeister