1) Yes - once you understand the user interface - the small buttons form the effect chain, click a button to bring focus to that 'pedal' then edit the parameters as if it were a stand-alone floor pedal. Bit fiddly to start, within 30mins you'll be able to do this quickly.
2) Yes and no - bass synths for me are near unusable - unreliable tracking and random level-changes. Octaver tracks well - very usuable. Similarly, the rest are good too: modulations, limiters/compressors, etc. Effect chains can get noisy and difficult to tame, particularly when multiple effects/simulations with gain are chained.
Find a shop with both (B3, etc) and give them a go...